Mr. Monk Can't See a Thing - S5-E4
Continuity mistake: The firehouse's number is 53, and is seen on the various fire trucks throughout the episode. However, in an establishing shot at the opening of the episode, you can see letters for "Eng. Company 1" and "Truck Company 1" over the garage door. This is because Fire Station 1, located in Los Angeles, was utilized for filming.
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.