Several weeks before shooting was to begin, Disney purchased the distribution rights to the film and demanded significant rewrites. Morton said the final result was a script that was not at all like the script that he, Jankel, and the cast had signed on to film, and that the tone of the new script was not at all compatible with the sets, which had already been built. Solomon recalled that he "felt like [his draft of the screenplay] was at least coherent," but upon visiting the set, [Morton] had cut it up with a bunch of other stuff he liked from other drafts and a bunch of new stuff. […] There was no through line." Leguizamo said, "It's eight-year-olds who play the game and that's where the movie needed to be aimed. [...] But [the directors] kept trying to insert new material. They shot scenes with strippers and with other sexually-explicit content, which all got edited out anyway." Richard Edson claimed that he and co-star Fisher Stevens were permitted to contribute their own dialogue at the writers’ approval: "If we could improve the script, they were more than happy. So we did our own [dialogue] and they loved it […] that made it a lot more fun for us."
https://en.wikipedia.org/wiki/Super_Mario_Bros._(film)