Mr. Monk and the Garbage Strike - S5-E2
Other mistake: The text in the news article about Jimmy's death is just gibberish and random keystrokes.
Mr. Monk Goes to a Rock Concert - S5-E8
Other mistake: At the end, when they're putting Kris in the cop car, you can see the car numbers don't match. On the door it's listed as car number "664", but on the roof it's is number "32" something.
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.
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.