Revealing mistake: After Helen finds the hair on Bob's suit, she goes to him while he is in the car and says," Have a great trip. I love you, so much.", Bob backs the car out of the driveway. He backs out and turns, but you can see his hand on the top of the steering wheel doesn't move.
Factual error: When the plane is attacked by missiles, Helen punches a button on the cockpit console and a screen lights up that says "chaff". The next shot shows the rear of the plane with several burning items coming from it that are supposed to be chaff. However, chaff containers burst open into thousands of radar-reflective strips that are meant to confuse radar-guided missiles (see real chaff in the movie Air Force One). What actually comes out are flares that burn extremely hot to confuse heat-seeking missiles. While it might be suggested that we just never see the containers burst open, later in the missile chase we see the exact same items in view for a much longer time and they never burst open.
Continuity mistake: After Bob gets back home from "re-living the glory days", you can see a barbecue in the back yard and it is on the cement deck. But at the end of the scene, when the camera shows an aerial view of the house, the barbecue is on the grass.
Continuity mistake: When Mr. I and Frozone are in the jewelry store, and Frozone goes to the water cooler to get a drink, you can see the handle is in a vertical position. When he has finished and leaves it, the handle stays in a horizontal position.
Deliberate mistake: During the chase scene at the beginning of the movie, Bob pulls up a map of where he is as opposed to the cop car and the getaway car. The computer then plots a merge pursuit course as being an immediate right, followed by a left turn and two more right turns. The car converts, then is shown taking an immediate left, then a right turn, a mirror image of what the map displays.
Continuity mistake: When Mr. Incredible saves the man that jumped from the building, their position changes between shots when they breaks the window. From behind, the man is bent over Mr. Incredible's shoulders but in the next shot, he's on his chest. The second shot happens at the same time, so it's impossible for them to be in two different positions.
Continuity mistake: When Dash and Violet wake up on the island, there's a section of rock wall right behind them. The bird asks for ID, Dash wakes Violet up to show her, and she steps forward. The camera switches positions a few times, then the kids turn around and run for it. Before they turn, the rock wall is on the left and there's a clearing to the right- but the complete 180 they make doesn't warrant enough space for them to go around the rock wall- actually, when they turn to run the rock wall is not only farther away from them, it's already behind them.
Continuity mistake: When Bob Parr goes to his boss' office to be told off, you can see the door in the background is closed. Bob gets up and walks toward the door which he has now supposedly opened. You never see it physically come into shot, but when Bob is told to close the door, the shot hasn't changed but you can now see the door in shot being closed, which means the door suddenly opened itself. The framing of the shot never changes, therefore we should have seen the door in shot.
Continuity mistake: In the beginning of the movie when Mr. Incredible sees the police chase, he checks his watch and says "Yeah, I've got time". Then he has the car put his super suit on. When he sits up and raises his hands to have his gloves put on, his watch is gone. Later, after getting the cat out of the tree, he pulls up his glove to check the time and his watch is back.
Continuity mistake: When Mr. Incredible and Mirage are having dinner next to the wall of fire, the long shot shows them at opposite ends of a very long table. All of the following close up shots of Mirage, shown over Mr. Incredible's shoulder, show them as being much closer together, at a much smaller table.
Deliberate mistake: Right after Mr. Incredible first lands on the island to find the Omnidroid, he starts to stretch and the camera angle changes, showing us his fat stomach that sticks out of his shirt. During the rest of the movie the suit is a one-piece, so this wouldn't be possible.
Continuity mistake: When Bob is in his cubicle before Mr. Huff shows, the pencil holder is on the left side of the desk, next to the computer. When Bob jumps up, but before the pencil holder's knocked down, it's in the middle of the desk. Then when he picks it up it's closer to the phone, but still in the middle of the desk. As Mr. Huff turns to leave, it's still there. But when the camera cuts to an overhead shot, the pencil holder's jumped to the opposite side of the phone, perched on the edge of the desk, where it falls to the floor.
Continuity mistake: When Mr. Incredible is chasing robbers in his super car and the old woman is trying to get her cat to come down from the tree, she sees him coming quite near and runs out onto the road to flag him down. Cut to inside the car, and the old woman is much further up the road than in the previous shot otherwise he wouldn't have had time to stop.
Continuity mistake: At the dinner table when Dash and Violet are fighting and Bob intervenes by lifting the table, the lamp above is not moving. Even after Frozone comes to the door and Bob lowers the table and they all get back into place, the lamp still hasn't moved. The shot switches to Frozone, then back to the table where suddenly the lamp is moving and Helen reaches up real fast to stop it from moving.