Genius Bonus: Chuck the Rain Spirit is a reference to Chaac the Mayan Rain God.
The Other Darrin: The sequel recast the roles of George, Ursula, and Ursula's mother; only Thomas Haden Church (Lyle) and John Cleese (Ape) reprised their roles from the first movie. It is said that Brendan Fraser was offered to come back but didn't want to go through the training process to get his body to the build needed for the role. He even came up with a joke for the movie that he would come back a bloated mess and be lured off the set by donuts, but it wasn't used.
The 2015 revival of the 2008 series replaced the entire voice cast due to production being moved from Vancouver to Toronto.
Un-Canceled: As of August 2013, the 2008 series has been picked up for more episodes.
What Could Have Been: Ursula was originally named Jane in the unaired pilot and early scripts, but ABC executives ordered it changed to avoid a lawsuit from the estate of Edgar Rice Burroughs. The staff named Ursula after actress Ursula Andress.
Brendan Fraser was supposed to show up in the sequel making fun of the real reason why he wasn't the main character (he wasn't willing to go through the extensive training he did for George in the beginning) - as a bloated fatass who gets distracted off-set by donuts. (The idea was by him, by the by.) It wound up being canned.