Mr. Monk Goes to the Hospital - S5-E16
Revealing mistake: When Monk and the others are examining the crime scene, the "corpse" can be seen breathing (his abdomen is rising and falling) and blinking. There are various shots in this scene taken from behind the body looking into the room, and some of these are pulled back so that the body is visible while others are zoomed in so that it is not; this is not a mistake, but suggests that maybe the actor was told he would not be visible in these shots and so did not need to hold his breath.
Mr. Monk and the Leper - S5-E10
Continuity mistake: When the body falls out of the balloon gondola, the weights that were securely tied to it have disappeared. The corpse also changes positions on the ground between shots, even though no one has touched it. (00:37:30)
Mr. Monk Makes A Friend - S5-E11
Continuity mistake: Monk leaves his front door standing open in anticipation of his new friend's arrival. No one goes near the front hall, but when Hal gets there, he lets himself in by opening a door that has somehow closed itself. (00:10:30 - 00:11:50)
Mr. Monk and the Leper - S5-E10
Continuity mistake: In the final scene, the pillows on Natalie's couch keep shifting positions between shots, from straight to crooked and back again. (00:40:30)
Mr. Monk and the Really, Really Dead Guy - S5-E15
Factual error: In real life, the FBI does not have jurisdiction over routine homicide cases, which are almost always left to the local police. They have no jurisdiction over serial murder at all, unless a federal employee is a victim or one of the murders gets committed on federal property (like an army base, federal prison or national park, or on sovereign territory like a reservation). The only time the FBI would be involved in a homicide is if the individual crossed state lines in committing the crime.
Mr. Monk Meets His Dad - S5-E9
Visible crew/equipment: Jack opens the diner door for Monk, and its glass window panes mirror the camera crew and a big rectangular studio reflector. (00:29:00)
Mr. Monk and the Big Game - S5-E3
Factual error: The hair dryer would not have hurt anyone as it was plugged into a FCI outlet. These outlets will immediately sense the interruption and cut the power to ensure electrical safety. The coach would have been alive. (00:02:23)
Mr. Monk and the Garbage Strike - S5-E2
Continuity mistake: When Captain Stottlemeyer's car stops, he pulls to the side of the road into a cluster of garbage bags, which are lining the entire road. When Natalie approaches the car, there are only a few bags on the curb next to it and the rest of the street is clean. (00:33:00)
Mr. Monk and the Class Reunion - S5-E6
Continuity mistake: At the start of the episode, when Katherine Rutherford is killed, she lands on her stomach with her eyes wide-open. Yet when Stottlemeyer and Disher arrive and see the cops looking at the body, she is now lying face-up and her eyes are closed. It is hard to believe that the police would move the body that much without first marking its original position with tape.
Suggested correction: It's a TV and movie trope that cops outline a body with tape or chalk, that's what photographs are for. But if someone found an old lady lying on her stomach, especially without blood, they might roll her over to check if she's OK or could be resuscitated.
Mr. Monk and the Big Game - S5-E3
Character mistake: When Julie asks "who discovered DNA?", Captain Stottlemeyer says "Watson and Crick. Two British scientists." However, James Watson is American (as of 2021 he's still alive), not British. And the duo only discovered the structure of DNA, not DNA itself. As much knowledge as the Captain demonstrates on the subject, he should know these two facts at least.
Mr. Monk and the Actor - S5-E1
Continuity mistake: At the end, when Monk is in Dr. Kroger's office, when he says "it's nice to be home", you see Dr. Kroger putting on his glasses. When the camera angle changes, he's putting his glasses on again.
Mr. Monk Visits a Farm - S5-E14
Continuity mistake: When Jimmy is talking to Harvey, after Harvey refuses the money, he puts his hand on Harvey's shoulder. But the next shot, it's off. It switches to back on depending on the camera angle.
Mr. Monk Is At Your Service - S5-E12
Continuity mistake: When Paul shoots his butler, you see him raise his arm up straight out, but in the next shot, his arm is lowered with his elbow bent.
Mr. Monk and the Leper - S5-E10
Continuity mistake: At the meeting, the pencils on the yellow pad on the table keep changing position depending on the camera angle.
Mr. Monk Meets His Dad - S5-E9
Other mistake: When Jack Monk is filling up his truck, the numbers on the pump don't add up right and keep changing. The cost is $3.599/gallon, but in one shot you see the sale price reads $93.78 for 28.348 gallons. The sale price should be $102.02. But in a later shot, he's only pumped 27.126 gallons. Then when he hits $100 sale price, it's for 31.259 gallons ($3.199/gallon) but in the next shot it reads 27.719 gallons.
Mr. Monk Meets His Dad - S5-E9
Continuity mistake: When Monk is looking through the boxes on the trailer, on the first shot, the box marked "Tucson" isn't flush with the box underneath. But after, it's flush without anyone touching it.
Mr. Monk Makes A Friend - S5-E11
Continuity mistake: In the shot showing Monk, the playing cards in front of him are upside-down. When it switches to show Natalie, the cards are face-up. (00:33:00)
Mr. Monk and the Leper - S5-E10
Continuity mistake: In the very last scene when Natalie leaves for her date, her flowers go from her hands, to the table, back to her hands, and then she sets them on the table.
Mr. Monk and the Class Reunion - S5-E6
Visible crew/equipment: In Monk and Natalie's first scene, where they are walking down a campus walkway, if you look in the lower left side of the screen, you can see the rail for the track that the camera rig is operating on. (00:04:25 - 00:05:20)
Mr. Monk and the Leper - S5-E10
Continuity mistake: While Dr. Polanski talks to Monk and Natalie in his waiting room, he's gesturing with both hands held out in front of him. When the shot changes angles, he's abruptly standing with his hands clasped behind his back. Next cut, he's gesturing again. (00:05:00)