Tim Burton's longtime composer Danny Elfman has a quick cameo in Batman Returns during a scene where Danny DeVito's Penguin sees his plans falling apart.
A Batman producer did not think Michael Keaton was the right fit to play The Dark Knight, but Burton convinced the producer to see the error of his ways.
The O.C. star Adam Brody "really dug" what James Gunn was planning for Guardians of the Galaxy, but Brody eventually lost the role of Star-Lord to Chris Pratt.
"Teenage Mutant Ninja Turtles: Mutant Mayhem" takes the Turtles in a fresh direction for a new generation, but it's bursting with nods to "TMNT" history.