Continuity mistake: When Mr Bean talks to his teddy bear before leaving his car, he says he'll be back in about an hour, at around 3. This would mean he's leaving the car at 2. But later, he arrives for the start of the pet show, which the blackboard states was due to start at 1.
Visible crew/equipment: Before the church scene, Mr. Bean drives into the car-park and knocks the blue car off the road. Look at the car closest to the camera, as Mr. Bean reverses, you can see a person and a crane above him reflected in the window. Also, in the blue car's window closest to the camera, you can see dolly tracks. (00:14:15)
Visible crew/equipment: When Mr Bean parks his car outside the examination hall, as he reverses into his spot, you can see a group of plain-clothed crew members pushing the camera reflected in the car nearest to the camera. More noticeable as the camera is actually moving. (00:00:35)
Revealing mistake: When Irma screams at seeing Mr Bean with his jumper pulled over his head, all of the other cinema patrons jump with shock - except for the woman directly behind the two of them, on the right of the screen. She just grins and laughs, forgetting that her character shouldn't be in on the joke.
Continuity mistake: In the scene at the country fair, Mr Bean interrupts a boy doing the buzzer game. When Mr Bean is on his second go at this puzzle and stands up after unplugging the device, you can see the same boy come round a table behind Mr Bean. Cut to the next shot, the boy has disappeared from where he should be behind Mr Bean and can now be seen walking across the back of the hall.
Continuity mistake: When Mr Bean is trying to get out of the car park through the entrance, he uses a wheelie-bin to simulate a car to get the gate to open. After he's out and shifted the bin, he's blocked in by another car. We see a hand take the next ticket (presumably belonging to the driver of the incoming car) but the car pulling up in front of Mr Bean is so far away from the ticket machine its not possible for him to take it and drive into the car park in the short amount of time seen, plus we never see or hear anybody get out of the car to get the ticket.