Mr. Monk Makes A Friend - S5-E11
Continuity mistake: Monk pushes aside a glass of milk on the table in his apartment. It is mentioned multiple times during the series that Monk is afraid of milk. He would never have any in his home, and certainly wouldn't have a neutral reaction to it. Also, the milk appears to have spilled a little as it was pushed, and yet in the next shot there is no milk on the table. (00:33:00)
Mr. Monk and the Red Herring - S3-E10
Audio problem: In the last line of the episode, the end of the word "spider" that Natalie is saying is cut off. It sounds like "spi." (00:42:05)
Suggested correction: I just watched the scene and I hear the whole word "spider."
Mr. Monk Takes Manhattan - S3-E1
Audio problem: The captain can be seen speaking, but no audio of him is heard. (00:14:10)
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 T.V. Star - S2-E12
Plot hole: Unless I missed something, the killer didn't wipe his prints off the knife he used to kill his ex-wife.
Mr. Monk Goes Back to School - S2-E1
Continuity mistake: Mr Monk completes his name on the chalk board at the beginning of class, but when class is dismissed the 'k' in Monk is incomplete.
Suggested correction: After he wrote his name, he says "what's up with that k?" and erases it. He started to re-write the k when he got hit by the eraser, leaving it unfinished.
Mr. Monk Goes to the Hospital - S5-E16
Audio problem: When Monk is saying "motive" in the phrase "this one had a motive", the word is spliced in two, as they used two different takes and combined them. Very robotic. (00:28:55)