The truck used by the crooks to block the intersection during the museum heist is the Belham Brothers Quarry truck from Mr. Monk and the Buried Treasure (2007).
The scene where the robbers take the Bethlehem Diamond includes a close-up clip reused from Mr. Monk and the Big Reward (2006) where another identical diamond is stolen after the glass is shattered the same way.
Larry Miller reprises his role as the attorney, Garrett Price, who first appeared in Mr. Monk Gets Stuck in Traffic (2005).
Mr. Monk's shirt size is 16" collar and 33" long. When Natalie asks the clothing department manager in the Christmas store if he has any shirt "Inspected by No. 8," she is referencing Mr. Monk's favorite shirt brand inspector No. 8 from Mr. Monk Goes to a Fashion Show (2006).
Karen Stottlemeyer (Glenne Headly) appears briefly during a clip in the opening montage. The clip in question was recycled from Mr. Monk and the Captain's Marriage (2006) when Monk and Natalie are following Karen through a mall.