Retroactive Recognition: Late into the line's lifespan, Mattel held a contest for fans to design their own character, which they would then make into an official action figure (the plan never fell through). The winner was Nathan Bitner, who grew up to design characters for the Halo series.
There were plans for a prequel to both MotU and She-Ra featuring an ancestor of the main characters, He-Ro. Yeah, those never saw the light of day, but He-Ro has recently been released as part of the MotU Classics toyline.
Similarly, Vikor, He-Man of the North, is a MOTU classics figure based on the earliest stage of what would become He-Man's design.
The Monogram figure kit line was almost cancelled in favor of another project (which didn't itself see the light of day): a 1/25 scale Dodge Diplomat police car.
Role Reprisal: The Mexican Spanish dub use the same voice cast from the animated TV series.
What Could Have Been: There were plans for a sequel, which got as far as early production. However, due to monetary issues Cannon Films lost the rights to the franchise, and the whole project, along with the cancelled Cannon Film's Spider-Man production assets, eventually turned into Albert Pyun's Cyborg