Continuity mistake: In the hardware store, a bright blue sign in the background reads "Electrical" in reverse. When Jake hands Monk his card a few shots later, the camera angle hasn't changed, but the sign has turned around and now reads "Electrical" forwards. (00:15:00)
Continuity mistake: After the quake, all but one of the art pieces have fallen out of the Rutherford's display case and lie shattered on the floor. But seconds later, when Christine pushes the cabinet over, most of the broken items have vanished from the floor. (00:02:30)
Continuity mistake: When Cora goes upstairs, her cat is curled up asleep in a chair. In the next, close-up shot, the cat is awake and sitting at the edge of the chair cushion, looking up at Monk with its front feet hanging over the side. When the shot cuts to wide angle again, kitty is instantly back in his original position, snoozing far from the edge and curled up against the pillows. (00:32:45)
Continuity mistake: In the scene where Monk meets Salvatore Lucarelli (Philip Baker Hall), Lucarelli is cutting up fisheads on a cutting board. Throughout the scene the fish on the table constantly change between shots. One of the notable changes is when Lucarelli is discussing the case he has for monk there is a shot of a fish, and when the shot changes you can now see the fish's head has all of a sudden been chopped off.
Continuity mistake: It's spring in San Francisco in this episode: warm with light rain and people outside in shirtsleeves. That is, until Monk goes to visit Kelly, when it suddenly becomes winter. Everyone's bundled in heavy coats and it's sleeting. After Monk leaves Kelly's house, it becomes spring again. [The Kelly Street sequence was originally meant to be used in "Mr. Monk and the Candidate, " where everyone is dressed appropriately for cold weather. For whatever reason, it instead got used in this episode.]
Continuity mistake: In this episode Randy is allergic to cats, in fact he has an allergic reaction even if a cat has been there lately but is not there now. But in Mr. Monk and the Sleeping Suspect, during the scene where Monk and the police are investigating the woman's destroyed house, a cat passes within a few feet of Randy, who doesn't sneeze or show any signs of his allergy.
Continuity mistake: When Monk is describing the laser pointer incident to Dr. Kroger, the doctor closes his black folder and puts it on the arm of his chair. In the very next shot, it's back in his lap, and he again closes it and places it on the chair arm. (00:25:00)
Continuity mistake: When Monk is leaving Derek Philby's classroom, he is quite content to just pick up a piece of chalk (with his bare hands) to write on the blackboard, but earlier, he makes sure to use a chalk holder to do this and nearly has a panic attack when he gets chalk dust on himself.
Continuity mistake: When Monk, the Captain and Disher talk to Dr. Scott during his cardio test, the doctor's hospital gown is falling off his left shoulder in about half the shots, but is pulled up to his neck in the rest. This alternates several times throughout the scene, though he never touches or adjusts the gown. (00:19:30 - 00:21:30)
Continuity mistake: Randy is desperately trying to pry his teenage acne photo off the doctor's wall. He knocks the photo underneath it crooked, but it rights itself in the next shot. Then he pulls his picture free, making a large hole in the wall, but knocks all the surrounding photos off onto the floor. There's no time lapse, but when he turns around, the fallen photos have all put themselves neatly back up on the wall, and the hole is gone. (00:32:30)