While Willie Nelson is rehearsing, his pigtails keep shifting from inside his shirt (close to his neck) to out near his shoulders.
As Stottlemeyer asks Wendy Maas his first question, his coffee mug is cupped in his left hand (his right arm is in a sling). There is a rapid cut to Maas and a rapid cut back to Stottlemeyer, and the mug has changed into a donut.
Sharona gets a call from the captain and on either side of the double glass doors of the police station there are big signs that say "Station 14." On the glass above top of the doors, it says, "Tiptop Lofts".
When Monk puts the brand-new mouthpiece on the clarinet, he immediately puts it to his mouth and starts playing. Reed instruments require the reed to be wet before using.
Most of the time the streaker is carefully made to look naked but during his run through the park, there is a clear shot showing that he is wearing black underwear.
After the streaker is caught by the police, a thin bikini string is visible on his thigh (as part of a thong), even though he is supposed to be wearing nothing but running shoes.
In the first scene where Monk is playing the clarinet, there is a moment where the clarinet is still playing but he doesn't have it near his lips.
Mrs. Mass references 4th Avenue. 4th Avenue is a residential street. 4th Street is where a club would likely be found.
When Mrs. Maas tells her personal story, she mentions growing up in Tampa, Florida. She also shows a family picture next to their car. At the time, Florida license plates began with a number that indicated the county of residence. Tampa, in Hillsborough County, was represented by the number 3. The plate on the car begins with "10," indicating Broward County on the opposite coast.
When Mrs. Haas confesses in the captain's office, the shadow of the boom mic is visible moving on the wall just above the door.