Mr. Monk and the Voodoo Curse - S8-E7
Continuity mistake: In this episode Natalie expresses she has a long deep fear of voodoo since Mitch was killed. But in the episode "Mr. Monk and the Wrong Man" (6-8), when Mr. Monk states that he thinks that the criminal is causing him pain using his tattoo with voodoo, Natalie responds to Monk saying "there is no such thing as voodoo."
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.