1. Scooby Doo was originally R-rated, aimed at older kids and adults — but was changed to be more family friendly, with even the cleavage of the actors removed with CGI, according to director James Gunn.
2. Rupert Grint was originally cast as Austin Ames in A Cinderella Story, but had to pull out in order to shoot Harry Potter and the Prisoner of Azkaban, so Chad Michael Murray scored the role.
3. The singing voice of Isabella in The Lizzie McGuire Movie was actually provided by Haylie Duff, Hilary Duff's older sister.
4. Chris Farley was originally cast to play Shrek and had recorded a lot of dialogue, but he died before his work on the movie was finished, and he was later replaced by Mike Myers.
5. Mike Myers originally didn't use a Scottish accent for Shrek, but after seeing a rough cut of the movie he requested to redo all his lines with the new accent, and producers agreed that it made the movie much stronger.
6. Corbin Bleu couldn't play basketball at all before getting the role of Chad in High School Musical. After he was cast, he carried a ball around everywhere — even to bed — so that he looked more natural with one.
7. Sharpay and Ryan were originally written as Black characters, but when Ashley Tisdale auditioned for the role of Gabriella, producers decided she was a better fit for Sharpay.
8. Jeremy Sumpter, who played Peter in Peter Pan, grew several inches while filming, and the window in the Darling nursery had to be resized two times to accommodate.
9. An alternate ending that matched the epilogue in the original Peter Pan book, in which Peter visits an adult Wendy and meets her daughter Jane, was filmed but cut from the final movie.
10. The scene where Mia trips in The Princess Diaries was actually unscripted — Anne Hathaway really fell, and director Garry Marshall thought it was so funny and charming that he included it in the movie.
11. There were four cats that played Fat Louie, Mia's cat in The Princess Diaries — one to be carried, one to be still, one to move, and one to sit on cue.
12. The director of The Incredibles, Brad Bird, had Spencer Fox, who voiced Dash, run laps around the recording studio in order to accurately capture Dash being out of breath.
13. Bird based the family's powers on archetypes: the strong dad, the mom pulled in all directions, the teen who feels she's invisible, the hyper-active kid, and the mysterious baby.
14. The "That's How You Know" scene in Enchanted took 17 days to complete because bad weather kept interrupting filming.
15. Amy Adams said any scenes where she had to wear Giselle's wedding dress were "gruelling" because the dress weighed 45 pounds.
16. Animators of Ratatouille kept pet rats in the studio to study their movements to get Remy right.
17. Remy's ratatouille was developed by real-life gourmet chef Thomas Keller. Keller also had a voice cameo as a diner.
18. Bridge to Terabithia screenwriter David L. Paterson is actually the son of Katherine Paterson, the author who wrote the book the movie is based on — which, in turn, was based on Paterson's own childhood and the death of his best friend.
19. AnnaSophia Robb was already a huge fan of the book and wrote a letter to the director begging to play Leslie, which helped secure her the role.
20. Anne Hathaway initially refused to sing in Ella Enchanted because she thought it would be too "cheesy." But after finding the right song — "Somebody to Love" — she agreed to do it.
21. Mary Gibbs, the voice of Boo in Monsters, Inc., was two and a half when she started work on the role. Filmmakers used a Cookie Monster toy to have conversations with her, which were then recorded.
