Other mistake: Early in the film, Jim Carrey is watching TV during a sports segment. He is watching Channel 7, the station he works for. This clip they showed was of actual WKBW sports director John Murphy. The clip they showed was taken directly from a real WKBW newscast, with the authentic news set, and graphics. However, when they show a clip of Ch. 7 News later, there are completely different graphics, and a completely different news set, both made for the movie.
Continuity mistake: After the riot in the streets of Buffalo, Bruce meets up with God again in the Omni Presents building. They discuss how everything is going wrong. At the close-up shot of Bruce's face when he says, "What do I do now?" the frame is flipped. You can tell this because his hair is parted on the wrong side and his nose looks different.
Revealing mistake: In the scene with the accident, the car already has bumper damage just before it hits the pole.
Visible crew/equipment: When Bruce goes back to the building toward the end of the movie looking for God and finds it deserted, as he runs through it, you can see the shadow of a figure (a crew member) on one of the columns on the left. It even slightly moves as he's approaching the ladder as if trying to duck away from behind.
Continuity mistake: When Jim and Jennifer are in the kitchen and Jennifer is commenting on how she thinks her boobs have gotten bigger, Jim is squirting ketchup onto his plate. When he first does this the ketchup goes everywhere all over his plate, cuts to Jennifer and then back to Jim and the ketchup is now in a nice neat pile.
Continuity mistake: Right before Bruce changes into the cloud shirt and black pants from the store, the people in the background disappear.
Continuity mistake: The scene where Bruce is putting a picture in the photo album, the right side of the page is empty. But when the shot changes, the right page now contains pictures.
Continuity mistake: When Jim Carrey parts the traffic and when the camera is on the side of his car and he starts to go, look all the way down the road you could see a person crossing the street but when it shows a sky view of him driving there's no one there.
Continuity mistake: In the diner, Bruce is looking out the window and the waitress walks up to him. You can see the two coffee cups on the side of Bruce's table next to each other. When the waitress asks "Coffee?" and the shot changes, one of the cups is suddenly at the centre of the table.
Other mistake: When Bruce is responding to the e-mail prayers on Yahweh., you can see the prayers don't change, they just repeat the exact same requests in the exact same order.
Factual error: In the Maid Of The Mist Scene where Bruce is talking on the phone with Grace in front of the boat, this is an impossible shot because the entrance to the Maid of the Mist is farther than that from the actual waterfall.
Continuity mistake: When Grace and Bruce are talking in the car outside her work, a woman with a blue or purple shirt with clouds on it walks past with a woman. The shot cuts to Bruce, then back to Grace and the woman walks past again but this time with a man.
Continuity mistake: In the scene where Bruce is confronting the gang that beat him up earlier, he has the monkey come out of the guy, who falls to the ground in pain. After the other guys run away, there is a shot of Bruce taunting them, but the injured guy is not on the ground behind him, even though he should be visible. A second later, he reappears when Bruce turns to face him.
Revealing mistake: When Bruce is at the restaurant and Jennifer Aniston believes that he is about to propose, watch her left ring finger, you can see the tan lines from her real wedding ring.
Visible crew/equipment: In the scene toward the beginning where Bruce is doing the cookie line in the mirror, Sam is in the other room peeing on the couch. When the shot changes to Sam, look to the far right and you can see a finger pointing to where the dog should be looking. The dog even appears to be looking straight in that direction.
Factual error: At the very end of the film Bruce is reporting on a drive for blood donors, and Grace leads him over to the booth to give blood himself - he is even wearing a tourniquet. However, he is supporting himself on a walking stick - he is not fully recovered from the injuries he received when he was run over, which happened when he was hit by a moving car - injuries which left him clinically dead. There is absolutely no way in the world that a person who has suffered life threatening injuries and has undergone the (inevitably) intensive drug therapies and surgical procedures involved while under treatment in hospital in the fairly recent past would be allowed to give blood. There is no way in the world the Red Cross (or the US equivalent) would want to encourage people who have recently been hospitalised to try to give blood. Not only would that be the height of irresponsibility, they would be wasting precious resources and staff time turning away people who would not be allowed to give blood.
Continuity mistake: In the diner scene, the ketchup and mustard bottles behind Bruce move (left to right) almost every shot.