Continuity mistake: When Simon Phoenix gets out of the sewer system (after gunning it out with the rebels and John Spartan) his left eye has the brown contact and his right eye has the blue one after going the entire movie with those contacts in the opposite eyes. (01:30:25)
Visible crew/equipment: During the scene where the whole family is first driving into Beverly Hills, in the scene where they give the finger to say hello, the camera crew can be seen in the reflection of some of the cars.
Continuity mistake: At the beginning, when the president lands in the helicopter, the shots go back and forth between the rotors spinning, and the rotors stopped. (00:02:10)
Continuity mistake: In a scene where Marisa Tomei visits Christian Slater at his home, she unties her scarf. A minute later, it is shown tied. Then she unties it for a second time.
Revealing mistake: When the boys' rival team challenges them, all the boys throw their gloves down, except Yeah-Yeah. When they all go to pick them back up, Yeah-Yeah has to pretend to pick it up.
Continuity mistake: When Wednesday and Pugsley are playing with the guillotine, Wednesday has a scroll in her hands, which she then rolls up. The shot changes and you can still see the rolled up scroll in her hands. However, the shot then changes again and you can now see Wednesday rolling up the already rolled up scroll.
Factual error: When Jean-Claude is chased by the helicopter in the woods alongside the river, the man in the helicopter fires a MP5 machinegun, but it causes huge explosions, this is impossible, it's not a grenade launcher!
Continuity mistake: After failing to catch Sassy, who went down the waterfall, Shadow and Chance are walking by the river bank. In one shot, Shadow's fur is wet, then dry, then wet again.
Revealing mistake: In one of Pickett's charge scene the bayonets are obviously rubber.
Continuity mistake: When they're in the jungle in Panama they see a train go past which has the Queensland rail (in Australia) sign on it.
Factual error: When Cruz is schooling Jaunito about "Quetzalcoatl" in the background the song "Low Rider" is playing. The timeline states it's 1972, but the song wasn't released until 1975. (00:08:10)
Audio problem: When Miss Orchid is making dinner for Wong Kei-Ying, she turns to him and tells him about a special chili that is made. When she turns back to her cooking, she tells him how hot it is but her mouth doesn't move.
Continuity mistake: In the scene when Tina Turner is running away from Ike she has to cross a freeway. If you look closely you will see that she has on high heels then she has on sneakers as she is running across the freeway.
Revealing mistake: At the end of the decisive game, the bad guy hits a deep foul ball. During that hit, they show the ball against a black background. If you look very closely at the bottom of the screen, you can see a hand throwing the ball.
Continuity mistake: The Pool of Death, as planned by Alex and Katie, has the water in the pool stained with red dye. When Sean slips back into the pool after having just emerged from it, however, the splash seen at that instant is clean water, not red-dyed water.
Continuity mistake: Dabney Coleman's tinted glasses are cracked, then the glass is missing altogether, and then they are cracked again.
Deliberate mistake: When Phil wakes up at 6 AM, it's already bright outside. At 6 AM in February, it would still be pitch-dark.
Visible crew/equipment: In the scene where Tom Cruise is crossing over to Mud Island, you can see the reflection of the rotor blades on the monorail from the helicopter which is filming.
Visible crew/equipment: When Charles Dance shoots his boss in the swimming pool, he starts talking to the camera about moving into the real world like Danny. Look at the glass mirror and windows behind him - you can see the film crew and cameras following him.
Other mistake: In the scene at the beginning where Phil eats Jason's Heart, you'll notice that he screams like a monster for a bit. Don't you think that the two security guards would easily hear the screaming and intervene, being that they're in the very next room? (00:13:40)