Continuity mistake: When Mr. Bean is dressing in his car on the way to the dentist, just after he puts his shirt on the camera cuts to show him from the rear of the car. In this shot he has his dress pants on already, but he hadn't put them on yet and in subsequent shots they are gone again.
Deliberate mistake: When Bean is putting on his socks as he is driving, his foot presses the horn in the centre of the steering wheel. Except that the horn control is actually on the right-hand column stalk (you can see the horn symbol on it). This was most likely an added comical sound effect.
Visible crew/equipment: In the opening scene of the episode, Mr. Bean goes around various places of his mini to get keys. During these actions, the camera pans with him. The cameraman's reflection is seen a few times during the pans in windows and sides of cars. He is wearing a checkered shirt and a green jacket. (00:00:55 - 00:01:40)
Visible crew/equipment: When the ambulance comes to pick up the heart attack victim, as the camera pans across the back of the van to see Mr. Bean with the jumpstart cables, a boom mic can be seen in the door windows at the top, whilst the dolly tracks and the dolly rig and the track can be seen reflected in the bottom windows. (00:05:55)
Revealing mistake: In the train scene when Mr. Bean plugs his ears with his socks you can see that he didn't use the ones he was actually wearing before. Once he took them off he placed them in front of him but reached slightly to his right for the ones he plugged in his ears. Also those where still flat like after ironing them and didn't look worn at all.
Continuity mistake: After Mr. Bean's musical performance, there's a shot of people applauding him. There's a man at the right of the group. In the next scene that same man is seen buying the last two Christmas trees, right before Mr. Bean gets a chance to buy any. There's only five seconds between the scenes. The man couldn't have run to the Christmas tree salesman, talk to him, and pay him for the trees within those five seconds. (00:10:25)
Continuity mistake: Mr. Bean puts Christmas cards in envelopes, then seals each envelope by licking each flap. Then he puts the envelopes through the mail slot in his door, pretending that someone else mailed them to him, which is funny. Then he opens each envelope just by unfolding the flap instead of tearing open the envelope, that means that each flap had not been sealed.