Crew or equipment visible: When Bean is standing alone in front of Whistler's Mother for the first time, he places his hands on his hips, which reveals his microphone transmitter.
Factual errors: The painting around which the film revolves is referred to universally as "Arrangement in Grey and Black, Portrait Of The Artist's Mother" by art galleries (the first part being Whistler's original title for the painting), not "Portrait of Whistler's Mother".
Continuity: From his side of the one-way window in the police station, Bean's tie appears straight and tidy with only the 'large' end on show. However from the police perspective on the other side of the window his tie is lop-sided with both ends clearly visible across his shirt.
Audio/visual unsynchronized: When Bean finds the turkey in the fridge, his mouth doesn't move when he says "Oh! Yes".
Audio/visual unsynchronized: In the scene where bean lands on top of Jennifer and she says, "Mom, Dad, *anyone*?" her voice is obviously dubbed.
Revealing mistakes: Near the start of the film, Bean is late for his meeting. In the meeting the boss greets everyone with a "good afternoon" when only just earlier it has shown Bean look at his watch and it was around 9:00 am.
Incorrectly regarded as goofs: When Bean takes off on the skateboard to "fix" the painting, the camera clearly shows his feet, and he's wearing black leather shoes. Later, when he's at the security guard station at the museum, there is a shot directly of his feet, and he is shown wearing mismatched slippers. It can be explained, as part of a joke, he would wear them so he wouldn't be heard; sneaking around the gallery.
Factual errors: The real painting is actually bigger than the one used in the film.