List of Mario & Luigi: Bowser's Inside Story pre-release and unused content

These are beta elements from Mario & Luigi: Bowser's Inside Story.

Beta elements
In the ROM, various unused sound files can be found. These include Yoshi's voice clips from Yoshi's Story, and some of the music from Mario & Luigi: Partners in Time. The PiT music won't play correctly, because it was replaced with BIS equivalent and the ones without equivalent have been replaced with "Tutorial" and "Tension" sequences. However, Yoshi voices will play correctly since they're wave files and weren't replaced or removed from the ROM.

In the E3 2009 trailer, after Mario saves Peach from flames at the start of the game, Bowser said "How dare you!", but in the final release he says "Crud!"

In the game, there is an unused item that looks similar to a Life Shroom but is named Dummy : if used, Mario (or Luigi) will throw it in the air (while inside Bowser) and it will explode, healing 60 HP back to Bowser. It was most likely scrapped because of the fact only the Sea Pipe Statue and Durmite can damage Bowser from inside.

All the enemies that the Mario Bros. can't fight still have an attack pattern for them (except the Dark Mechawfuls, as they were unfinished, and the final boss).

In some early screenshots, it was seen that Treevils were battled at Plack Beach. They are now fought in Dimble Wood, possibly because of the fact they are trees. Also, the area they were battled was at the site of Sea Pipe Statue.