Recycled Script: The episode "Endangered Species", is about a wolf child turns out to be the heir of a murdered co-owner of a company, and the other co-owner wants to finish the job. It was recycled, almost scene for scene, from an episode of Manimal called "Female of the Species". And then the script was recycled AGAIN in 1994 for an episode of Thunder in Paradise, also titled "Endangered Species". The same writers - Michael Berk and Douglas Schwartz - are credited for all three shows.
What Could Have Been: Had the series made it to a second season, H.E.N.R.I. the robot would have become a regular. The Wizard fansite has drafts for two episodes that would have been written, and H.E.N.R.I. is prominently featured in both of them. He might have even been intended as a replacement for Tillie; she is not in the finale, and neither draft mentions her at all.
Written by Cast Member: David Rappaport helped with "Trouble In The Stars", getting a "Story By" credit in the intro.
Old Shame: Jenny Lewis considers her involvement with this movie to be one, particularly after she established herself as the lead singer of indie rock group Rilo Kiley. In an interview from 2003, Lewis described The Wizard as something that she wished people would stop asking her about, noting "That's cool and all, and that was fun, but it just gets like, a bit annoying because I feel like I have more interesting things to say." In a 2019 interview with Rolling Stone, Lewis explained that she was uncomfortable with her association with The Wizard because early in Rilo Kiley's career, hecklers would show up to their concerts just to yell video game references at her.
Originally the Game Boy was going to appear, but Nintendo didn't want it in as they feared it would be too early of a reveal to competition; Not that it mattered much in the end, as the film would end up releasing five months after the handhelds American debut.
Originally, Haley's home town was going to be Las Vegas. However, the film crew couldn't find any casinos in Vegas that would allow them to film with the kids nearby, so Reno became her home town instead since it was the next best option.