Director Rob Bowman confessed he had to read the script 15 times and then hold an eight hour meeting with Darin Morgan to fully understand all of its intricacies.
The iconic "I Want to Believe" poster can be seen in Blaine's apartment. However, his poster has "Want to" crossed out, leaving only "I Believe."
In a later interview with Playboy magazine, Jesse Ventura admitted that he had no idea what the significance of his lines actually meant.
The alien Lord Kinbote was meant to be an homage to stop-motion animator Ray Harryhausen. The suited performer was filmed in a way to make the alien's movements look a little like stop-motion.