Flip Flop of God: The director on whether the events of the film were real or all in Quaid's mind. In the commentary, Schwarzenegger leans more to it actually happening, whereas Verhoeven leans more towards it being the ego-trip.
Marc Alaimo, best known as Gul Dukat on Star Trek: Deep Space Nine, enjoys one of his more prominent (if typically brief) film roles in a career of bit part work as the captain of the guards in the Martian spaceport.
Also from DS9, Benny was Legate Damar's short-lived successor during the Dominion War.
Troubled Production: The Mexico City shoot was considered a nightmare for most of the cast and crew. Many cast and crew members got sick at one point from contaminated water (the only major members of the production who didn't get sick were Schwarzenegger, who had remembered being sick during the Mexico shoot of Predator and took special precautions, and producer Ronald Shusett, who would give himself B12 shots each day to avoid illness) and the air was so polluted that Schwarzenegger recalled having trouble breathing on most days.