Trivia: Notice how on the final subway they pass Booth street (a reference to John Wilkes Booth who killed Lincoln) and are supposed to get off at Oswald St (referencing Lee Harvey Oswald who assassinated Kennedy.) Another reference to Lincoln is made earlier in the film with the pictures.
Trivia: Director James Wong noted that two characters were composited into the script. Two boys sneak onto the coaster, while Wendy and Kevin sit behind them; the boys are then removed by a ride attendant, leaving an empty car between Wendy, Kevin, Julie, and Perry. This was done to give Wendy and Kevin a reason not to know who was sitting in front of them, and to give a sense of relief that two innocent lives were saved from the crash.
Trivia: The ending was re-shot, reportedly because of unfavorable reactions at preview screenings. This also happened with the two previous films in the series.
Trivia: The scene taking place in the tanning booth was a closed set. Only the camera operators were in the same room with Chelan Simmons and Crystal Lowe and black curtains were draped to keep onlookers out.
Trivia: It's been mentioned that Tony Todd is the voice on the roller coaster, but also notice the sign at the entrance to the roller coaster. It has the words "I'll see you soon" which was exactly what Tony Todd's character, a.k.a. The Guy at The Morgue, says to Alex in the first film as he and Clear leave the morgue.
Trivia: When Wendy is driving to the Centennial, she sees a large, black wolf in the road. This is likely a reference to a creature mentioned in mythology, known as The Grim by Harry Potter fans. A large, black canine that often serves as a death omen.