List of Mario Kart 7 glitches
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This is a list of glitches in the game Mario Kart 7.
Bad A.I. in Big Donut
In local multiplayer, if an A.I. player is struck before it flies off a glide ramp, making it fall into the lava, it respawns. Then, after it respawns, it may drive directly into the lava. The computer player can repeat this several times.
Daisy Cruiser Floor Drop Glitch
If the player goes to the right side of the split path and stops at the end of the fence, they should then accelerate and hold right on the circle pad, and fall off the edge. If done right, the player should fall through the striped curb, down to the bottom floor where the tables and chairs are. Luckily they can go through the fence, instead of having to be stuck in the area forever. It is recommended that the player should use a feather-weight character and the Koopa Clown kart and Roller/Mushroom tires to do the glitch easily.
GCN Dino Dino Jungle Shortcut Glitch
Just before the bridge where the dinosaurs head is shown, the gliding ramp appears. If the player has the Flower Glider (because it's light and gets very high air) and goes off the gliding ramp and skips over the fence line, the game will count that as a lap. The player can also cut across the portion of the rock nearest to the fence, preferably landing in front of the last small ramp.
Disappearing Spiny Shell Glitch
If a Spiny Shell misses its target, it will loop around the entire track, circle around whoever is in first place when it arrives, as opposed to its original target, then disappear before hitting them.
DS DK Pass Fence Glitch
Upon reaching the glider panel, it is possible to glide over some areas of the fenced-off area, many parts of which will result in Lakitu pulling the player back onto the main course. However, near where the out-of-bounds area meets the track, it is possible for the player to land inside the area and clip through the fencing at the same time, without any problems or Coin losses.
Extra Balloon Glitch
In local multiplayer, sometimes, when a racer (can be a CPU or a human player) gets hit and the balloon pops, another balloon immediately respawns and takes its spot. This glitch is caused by lag, and the more lag the player has, the more often it occurs. The glitch does not occur when two players are in the same view area.
GBA Bowser Castle 1 Re-spawn Glitch
On GBA Bowser Castle 1, if the player jumps over the wall into the lava right before the 3rd turn, the player will be re-spawned near the second Boost Panel. This glitch saves 1 second, and can be done without a mushroom if the player drifts and jumps on the left wall after the 2nd turn and drives straight until he reaches the part where the two walls intersect.
Note: As of May 15, 2012, a patch has been released for Mario Kart 7, which renders this glitch unusable in Online Multiplayer. However, it can still be performed offline.
Ghost Data Information Glitch
Sometimes on occasion, some information of the Ghost Data (seen in the Time Trial track selection screen) will become jumbled and become incorrect, such as the Ghost Time and the country flag. This can be fixed by moving through the Ghost list until the information reloads itself.
Ghost Placement Error
Occasionally, the placement of the Ghosts on the screen will be incorrect.
Gliding Ramp Glitch
When the player reaches a blue ramp which activates the glider, they should turn around and drive backwards towards the ramp. Every time the player touches the ramp, they will just go forward as if they got bumped lightly and the sound effect for the glider coming out will play. Occasionally, the glider will come out, but the racer will go backwards.
Gyro Controls Camera Glitch
Maka Wuhu Shortcut
On this track, just after the start of the second section, in the mouth of the cave, if the player turns around and hops in the water just after the fence ends, or uses a Mushroom to hit the rocks on the wall, the racer will be caught by Lakitu and, if done correctly, will make the player start at another area of the track, next to Summerstone Castle and at the top of the mountain, near the third section.  This gives the racer a big advantage on the race, being easier to do in Time Trials as the player will start with three Mushrooms. The time saved is approximately 20 seconds.
This glitch can also be performed by landing in the water beside the fence without touching the rocks. This is a much easier way to do the glitch and can be done without the help of a mushroom.
Note: As of May 15, 2012, a patch has been released for Mario Kart 7, which renders this glitch unusable in Online Multiplayer. It can still be performed offline, however.
Maple Treeway Shortcut Glitch
The player needs to be Metal Mario in the B Dasher in Slick wheels and take the shortcut at the beginning of the level. In the part before the cannon where the player should turn left, the player should not. When going up the wall the player should then hold left and hop. The player might bounce on the floor and enter the cannon from a high altitude. If done correctly, the player will fly over part of the course and land by the Wigglers. 
Multiple Jump Glitch
The player needs to go to DK Jungle or GBA Bowser Castle 1 to perform this glitch. They will need to position themselves (near the Temple in DK Jungle) to face the left corner right beside the entrance. When they use the boost, the player will start jumping multiple times non-stop. The player will have to hold the /button to keep their kart jumping. If they let go of the button, they will get a small boost and move forward. This glitch is hard to master.
This glitch is most easily done in DK Jungle. If the player's kart is wide enough (Medium + B Dasher + Red Monster works well) The player must go to the last jump ramp before the temple and fall off. If done correctly, Lakitu will pick the player up on the last ramp, facing to the left. The player must hold / the whole time Lakitu is dropping the player, so the player doesn't get the boost. The player must then keep holding / so the player drives forward. Of done correctly, the player will be bouncing by the entrance to the temple. If the player holds up, the player will bounce lower, while if down is held, the player will bounce higher. If the player hops right when hitting the ground, the player will bounce about twice as high.
Neo Bowser City Glitches
Random Twirling Glitch
Rock Rock Mountain Gliding Glitch
The player can use any kart, character and glider; the glitch requires a Mushroom.
At the last ramp, the player must go straight, and cut the corner. When the player is about to fall over the precipice, they must use a Mushroom and hit the mountain above the entrance to the cave. By doing so, the player finds the wooden plank above the entry with the glider on. Also, if the player stays up there for a short time, Lakitu will place them back on the track near the entrance to the cave. The trick is similar to that of Toad Circuit.
Streetpass Freeze Glitch
For an unknown reason, if the player does not check on the Mario Kart Channel for a long period of time, when they attempt to race with anyone from Streetpass, the 3DS will forever loop a "preparing screen". If the lid on the Nintendo 3DS is closed, or put into Sleep Mode on the 2DS, the 3DS will show the same image on the bottom and the Top screen, with the top screen askew from the rest.
Through the Rainbow Road
In Rainbow Road, the player must drive on the second blue Boost Pad to use the glider. They must slowly glide down and get under the next road. Gliding up, the player will occasionally cross it.
Toad Circuit Gliding Glitch
To attempt this glitch, the player must be on Toad Circuit and have at least one Mushroom. When the gliding ramp becomes available, the player must carefully aim where the red Toad balloon is. When the player just starts gliding, they must pass the bridge and then aim towards the ground (without actually touching it - the player just has to be close to the ground). When the player passes the Coins, they must use the Mushroom and go up at the same time. Then the player will hit the face of the Toad balloon. While still pointing up, the player will then later hit the top edge of the tunnel. If done correctly, the player will become stuck on the top edge of the tunnel. The only way to end this glitch is to just point towards the ground or by pressing the B button. There are also some cases where the player goes through the ground when trying to end the glitch.
Triple Banana Glitch
It is possible to cause a banana to clip through the player's kart while reversing. If a character somehow loses the second and third banana, only leaving the banana furthest away from the kart, and reverses, the banana left will still be attached to the kart as if it was still chained to the others. However, should the player reverse, the banana 'chain', following where the kart has been, will temporarily clip inside the kart itself.
Unrendered Airship Fortress
In Airship Fortress, if the player looks backwards after being flying into the tower, the track near the starting line will not appear.
Watch Through the Wall Glitch
This glitch requires the Roller wheels. In Piranha Plant Slide, directly after the start, three lines, one yellow, one red and one green, split the road in three sections. One should do a trick over the ramp and land right at the highest point of the yellow-lined road. If done correctly, the camera switches angles and the player can watch right through the wall. The effect stops if the player goes underwater after the road.
Sometimes, if a player finishes 2nd online, but bumps into first as they finish, the player who came second will hear the 1st place music, making that music the wrong piece.
Wuhu Loop Shortcuts
As of May 15, 2012, a patch has been released for Mario Kart 7, which renders these two glitches unusable in Online Multiplayer. However, they can still be performed offline.