Mr. Monk and His Biggest Fan - S6-E1
Continuity mistake: When the Captain is approaching the killer, a piece of wood is protruding from the cart. After a cut, that wood suddenly disappears. The cart has also inexplicably shifted to be much closer to the killer. (00:40:00)
Mr. Monk Joins a Cult - S6-E11
Continuity mistake: Ralph has his hand on Monk's shoulder during the applause, but after a cut, his hands are both suddenly stretched into the air. (00:21:50)
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.
Mr. Monk and the Three Julies - S6-E13
Continuity mistake: In the very first scene when Natalie is running to Stottlemeyer's car, she throws the walkie talkie through the open side window into the car. But in the next two shots it is back in her hands.
Mr. Monk Is on the Run (1) - S6-E15
Continuity mistake: When Mr. Monk is first arrested by the Sheriff, his arms are fully extended for the entire time that he is lying face down on the floor and his head is turned to one side. However, later on, Mr. Monk explains on the phone to Captain Leland Stottlemeyer how the Sheriff framed him. While the Sheriff is changing the gun barrels during Mr. Monk's explanation, you now see Mr. Monk with both of his hands behind his head and his head is now face down on the ground.
Mr. Monk and the Birds and the Bees - S6-E5
Other mistake: Monk wasn't afraid of heights, as he climbed on a chair to unscrew a vent.
Mr. Monk and the Daredevil - S6-E7
Continuity mistake: When Natalie's fighting with Harold's cousin on the roof she loses her shoes. A shot later, and they're back on her 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 Is on the Run (2) - S6-E16
Plot hole: When Stottlemeyer is confronted by the Sheriff for not going to the morgue there are 2 plot holes in that one scene: first it is impossible for that article to be in the morning paper since the coast guard "just fished him out" last night. And secondly an article, especially a long article like the one about the body in the bay would contain a physical description of said body. That is the reason it does not make sense to even ask the captain why he did not go to check the body to see if it was Monk when the body was tattooed and had red hair. (00:13:30)
Suggested correction: The article being there that fast is a bit odd, the sheriff mentions a police alert had been put out and was why he went to the morgue. That was what he was confronting the captain about. Even without the article the point of why he didn't check is still a valid question.
Do you really believe that the police alert did not include a description of said corpse being found for the missing person's unit to combine against their lists?
Mr. Monk and the Three Julies - S6-E13
Plot hole: There is no other reason for Randy to hand Natalie the walkie-talkie but to fill that plot hole. He is in fact in breach of police rules when he hands his department issued radio to a civilian to answer it while he is on duty. The same goes for Stottlemeyer and the car keys he hands to Monk. Even more so since he knows Monk could not even drive that car to the side in the far fetched scenario that a police car had to be moved while the cop is serving a warrant inside the building the car is parked in front of. (00:01:15)
Mr. Monk Is on the Run (2) - S6-E16
Other mistake: Strangely, no one tries to stop Monk and Natalie as they walk through the centre of the parade and stand amongst the brigade.
Mr. Monk and His Biggest Fan - S6-E1
Continuity mistake: When Natalie is talking to Marci at Monk's door, Natalie's position in relation to the door changes between shots. (00:04:45)
Mr. Monk and His Biggest Fan - S6-E1
Continuity mistake: As Marci is telling Monk about the picture she painted of him, Monk and Natalie approach her. As they approach, they change position between shots. (00:10:30)
Mr. Monk Is on the Run (2) - S6-E16
Continuity mistake: In Season 6, Episode 16, "Mr Monk Is On The Run Part 2,," Natalie is organising his funeral after Monk is announced dead in the previous episode. She is talking to Randy and says she found a picture of him smiling. You see the photo of Natalie, Adrian and Julie on Christmas Eve. This picture was taken in Season 6, Episode 10, "Mr Monk and the Man who Shot Santa Clause". In the photo you can see the three of them smiling. But when you see the picture taken on Christmas Eve, Adrian is not smiling. He has a disgusted look on his face after he ate a cookie. Also when the picture was taken, Julie was smiling with her mouth closed but in the photo she is smiling with her teeth.