Mr. Monk Joins a Cult - S6-E11
Revealing mistake: When Monk and Natalie are talking to the cult members, a Culver City bus can be seen driving in the background, which is a Los Angeles bus, but the show takes place in San Francisco. Culver City is home to a lot of movie shooting. (00:09:15)
Mr. Monk Gets Stuck in Traffic - S3-E13
Revealing mistake: When we see a shot of Steve in his car while in the dump truck, it's shot in a studio and the shot is reused each time we see Steve in the car. The shadow is completely different and at one point, when they show Steve in the car with the car and truck bouncing around, you can tell the image is just shaken, rather than the dump truck actually bouncing. There are loose chains hanging off the inside walls that don't move or sway at all.
Mr. Monk Makes A Friend - S5-E11
Revealing mistake: During the fight scene in the restaurant kitchen you can see that the woman is a stuntman, you can even see the horrible wig pop up off the stuntman's head a few times.
Mr. Monk's Other Brother - S7-E10
Revealing mistake: When Reese opens fire on Adrian, Jack and Natalie at his house, in a shot from Reese's perspective, the squibs from bullet hits on the ground appear to be below the barrel's trajectory. The bullets should be hitting the ground closer to his targets' feet.
Mr. Monk and the Daredevil - S6-E7
Revealing mistake: Watch as Natalie fights with Harold's cousin on the roof. The same shot where she's barefoot, she's also got thicker hair, indicating a wig on a stunt double.
Mr. Monk Takes Manhattan - S3-E1
Revealing mistake: Monk's reaction to the gunshots begins just before the gunshots go off. (00:03:55)
Mr. Monk and the Voodoo Curse - S8-E7
Revealing mistake: In the scene where the desks in the office are re-arranged, you can see that all the computers are on but none of them connect to any power point. NB: You can vaguely see that one of the computers is supposedly on Youtube while another is on Google Maps.
Mr. Monk Makes the Playoffs - S7-E13
Revealing mistake: 7-13, "Mr. Monk Makes the Playoffs": The supposedly live stadium crowd outside Bob Costas' press box is a noticeably fake photo-backdrop. Not a single "person" in the multitude of thousands is moving. (00:40:10)
Mr. Monk's Favorite Show - S8-E1
Revealing mistake: The car that explodes isn't sitting in a striped parking lot space. In fact, it's very obviously parked out in the middle of the lot's traffic lane, well away from any other vehicles, precisely because the special effects crew are about to blow it up.
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.