Towards the end of the episode when Monk and Samuel are roughing up Kenneth Nichols and are holding photos of their wives and having Mr Nichols say the wives names, Monk's grip on Trudy's photo changes with each change of the camera angle.
In the scene where Monk and Samuel are having juice in Monk's apartment, Monk gets up to get a bag for Samuel to blow cigarette smoke into. The level of juice in Monk's glass increases during this.
When Kenneth Nichols fires the employee (presumably the dishwasher) out back, he tells him, "you get your paycheck on Friday". California law requires that if you are fired, they have to give your last paycheck right then and there, on the spot. The Board Of Labor Relations imposes a rather stiff fine if the employer doesn't.
When Mr. Monk and Samuel are trapped in the back of the killer's truck, they are surrounded by frozen fish which means the temperature is quite low, however Samuel is seen sweating and their breath isn't visible which would be the case if they were actually in a sub-zero environment.
The body of the murdered maid had been lying on the floor for 12 days, but there is no sign of decomposition at all.
When Mr. Monk is laying flowers at the site where Ansara Waingaya died, a cable car passes.
On the cable car you can see a reflection of a spotlight.
Last scene as the cab pulls away, across the street you see a NYC-style subway station "Broadway-Taylor St Station BDFY". No such subway station in NYC or in SF.
When Mr. Monk is dialing the phone in the restaurant to call the captain, he hits a total of 14 buttons, including the # key.
When Monk is explaining about doing laundry to Samuel he lists green and indigo amongst the primary colors. The only primary colors are red, blue and yellow.
Based on the way the piles of clothing are laid out, Monk apparently means to say they are the colors of the rainbow: Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROY G BIV).
Based on the way the piles of clothing are laid out, Monk apparently means to say they are the colors of the rainbow: Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROY G BIV).