Mr. Monk and the Bad Girlfriend - S6-E4
Continuity mistake: In the first shot, when the captain is chatting on the computer and Monk is looking at him through the glass, the webcam we see is white and round. In the next scene, when Monk goes into the captain's office, the webcam is now gray and square.
Mr. Monk and the Bad Girlfriend - S6-E4
Continuity mistake: Watch the bore brush as Monk is looking at it in Linda's house. It's straight at first but is bent a few shots later.
Answer: Notice also that in the opening credits scene when he is touching parking meters her also wipes his hand on his clothes each time he does it.