- Tom Hanks was set to play Mario, but was fired by the studio when they decided he cost too much. Lucky him.
- Danny DeVito was also lined up to play Mario.
- He would have also directed.
- Both Michael Keaton and Arnold Schwarzenegger were at one time lined up to play Koopa, but they both ended up turning it down.
- Bob Hoskins didn’t know that the movie was based on a video game until his son told him and showed him the game.
- Dennis Hopper said it was the worst film he’d ever done. He was probably right.