When Stottlemeyer goes into his office, Monk is using the yo-yo from Mr. Monk and the Captain's Marriage (2006). Stottlemeyer then paraphrases the mantra learned during anger management classes where he had been given the yo-yo.
When looking for the card for the owner of box 503, the next card has the name Bridget Jones on it.
Eve Gordon reprises another role for Monk. Here, she plays the bank teller Madge. In Mr. Monk Goes to the Asylum (2002), she plays psych patient Janie.
The combination on the lock to the telephone wiring (that Stottlemeyer and Adrian Monk use Trudy's bracelet to saw through) is set to 420, a slang term for marijuana.