Revealing mistake: After Mr. Bean crashes into the van with the feathers in it, and then goes inside, he coughs, and feathers supposedly come out of his mouth. However, from the way he does it, you can see the feathers were in his hand to start with.
Add timeThe Doctor
Revealing mistake: At the end when Mr. Bean blows up the paint and it splatters all over the walls in his apartment, he comes back in and his doorknob is covered in wet white paint which he pushes shut. Only problem is that when he pulls his fingers back, there is no wet paint whatsoever on them.