Revealing mistake: Very near the end of the movie, when the NOAA director is viewed in the helicopter as it approaches NYC, the image is reversed, verified by the David Clark logo on his headset being reversed. There are two different shots of this just a few seconds apart, and they are both reversed.
Revealing mistake: Nearly at the end, the scientists find Alice's body at the waterfall, one of the men lifts up the cloth to take a look at her face. Her face is badly burned on one side and she is pronounced dead. However, take a look at the left side of her neck, you can see her either gulp or take in a quick breath of air. (01:19:05)
Revealing mistake: Robin Williams is working on Bannister's rememory, scanning newspaper articles. Under the first headline, "Bannister Eyes Future," the copy reads, "Whoever wrote these headlines had as much fun as I did setting them in type and formatting them into newspaper articles. But then, this sort of headline appears in the paper regularly, so maybe we all just want to have fun. Fun: such a precious commodity these days."
Revealing mistake: When the man is melting after being covered in acid in the beginning, you can see a wire pulling the "melted skin" off his arm, at the bottom of the frame briefly. (00:04:00)
Revealing mistake: When they fix the door, in the last few frames we see while the door is still moving up, the gear stops spinning in the "rail".
Revealing mistake: When John uses Scorpius as a shield and takes cover in front of him, as John fires at the Tregans behind Scorpius, there are round black devices attached to the back of Scorpius' suit that are there for the gunfire special effects, which suddenly appear then disappear after.Super Grover