Revealing mistake: Near the end when Ace gets into his Cadillac, in the first shot facing the front of the car, there is a protective glass in front of Ace (the same width as the windshield) with the dashboard in between that glass and the windshield. Note the vertical edge of the glass is visible at the right side, and the rearview mirror's sticker on the windshield casts a shadow onto the second glass. During the stunt, the flames on the dashboard are between the glass shield and the windshield, keeping the actor safe from harm. (02:46:05)
Revealing mistake: The kid in the wheelchair is playing a Game Gear with no game in it.
Revealing mistake: When Two Face and Riddler enter Wayne Manor, and knock Alfred down. Alfred, unconscious, pushes the dinner tray aside, so the thugs can carry him into the closet. (01:27:55)
Revealing mistake: Sloth is shown with three "arms." It's most easily noticed after he wakes up. His right arm is bent at the elbow, pointing to the ceiling, his left arm is pressed tightly to his left side between his torso and the jacket used to conceal the upper part of the prosthesis, and his third "arm", the prosthesis, is bent at the elbow, hanging halfway off the bed, and pointing to the left of his body. It has several large, protruding "veins" in it and the stump where the hand should be is off-screen.
Revealing mistake: At the end of the chase scene with the Mercedes and the pickup truck, the Mercedes flips on its side and slams into a tree. As the Mercedes falls back onto its roof, you can see a rope attached to the trunk used to pull the Mercedes over.
Revealing mistake: In one of the final scenes where Stallone is hanging out of the Statue of Liberty, you can see that his "JUSTICE TATTOO" on his upper arm is a fake. You can see at the edge of the tattoo that it is glued on the skin.
Revealing mistake: When Chris Tucker is found dead from an apparent heroin overdose, you can see him still breathing on the chair.
Revealing mistake: In the gun battle following the bank robbery, Drucker fires his shotgun at Cherrito. A female pedestrian in the background (apparently unaware she's in the shot) can be seen acting casually, without any reaction to the gun battle taking place.
Revealing mistake: Towards the end of the movie, Hockney (Kevin Pollack) looks into a van and discovers it's full of cash. He is then shot from behind and blood splatters all over the money. When his chest explodes, you can see the plastic of the bag the blood was in. (01:18:10)
Revealing mistake: In the scene where Angela is in jail, she goes to make her one phone call. When she is talking on the phone you can see that the receiver is already in the down position, meaning that the call is already disconnected.
Revealing mistake: When John jumps onto the tracks on his bike, look closely and you can see there is wood or some other material between the rails for him to land on. (01:20:20)
Revealing mistake: The fight scene between Peter Kurten and Andy outside the gay bar is viewed from behind a metal gate. Peter smashes Andy's head into the gate twice. The bars of the metal gate bend towards the camera as if they are made of rubber.
Revealing mistake: In the scene when Joey got busted by the FBI for hacking, he was taking a shower. They then took him to the living room and sat him down on couch with nothing but a towel wrapped around him. As they confiscated Lucy the computer for evidence, he lunged over the couch to try to save her/it. The towel falls off and his butt is in plain view, but his genitals don't exist. Instead, there is a flesh colored pad concealing his privates from the viewers. (00:32:40)
Revealing mistake: When the two ladies go to the party relatively near the beginning, one goes off to the toilet. The other one gets shot (through the cushion) she then falls back on a coffee table which completely shatters before she even hits it. (00:26:10)
Revealing mistake: When Jim is rescued from the snow (thrown over Reggie's shoulder), he moves his leg, although he is supposed to be unconscious.
Revealing mistake: When El Mariachi's one friend first fires a rocket at the bad guy's limousine in the climactic battle, you can see that the rocket itself never explodes, despite the side of the car blowing up. The rocket simply lands next to the car, and then remains there in plain sight whilst the side of the car blows up, revealing that it is just a prop replica.
Revealing mistake: When Bain is in the bath and communicating with his employer, you can see he is just punching random keys on the keyboard that do not match up with what he is supposedly writing. First, he writes "Nothing. I retired the buyers", but he never touches the "n" or "e" keys. A little later, he types "And", but his hand never comes near the "a" key. (01:07:10)
Revealing mistake: When the tube is being inserted into Crazy K's nose, an imperfection in the tube is visible near the orderly's fingers. It doesn't move, despite the orderly "inserting" the tube.