List of Super Mario Bros. pre-release and unused content
From the Super Mario Wiki
These are the deleted scenes for the Super Mario Bros. film.
In a interview with Mark McCoy, designer of the movie, McCoy released an early script of the movie-the original script was much different from the one that remained . The unused script has a character known as Doug that doesn't make the final cut and the scene where Mario and Luigi meet Daisy was changed. There is also another unused script from 1991 written by Tom S. Parker and Jim Jennewein. This 1991 script is more fantasy based and is closer to the video game, having more elements from the game than the actual version. The copy of this script can be bought from Scriptfly.com. The original script also had Toad playing a much larger role within the film from originally betraying the Mario Bros. to President Koopa to later helping them as a result of his regret for the mistake he did.
Fire Snakes were originally written into the desert sequence of the Super Mario Bros. film, but were cut for unknown reasons. Scripts state that they "[...]resemble moray eels, their mouths filled with pointed piranha-like teeth," and that "They gnaw through the skin, burrow into the body cavities, and lay their larvae. It can take weeks for the host to die."