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."
Plot hole: The murderer planted the voodoo dolls after the accidents to make them look like victims and cover up her murder of her uncle, but none of that was necessary! She uses an untraceable poison on her elderly uncle to make it look like a heart attack. So if he'd died...they just would have figured it was a heart attack! No suspicion would have fallen on her anyway, the entire voodoo thing was just needlessly complicated and only exists for the episode's plot.
Revealing mistake: In the scene where the desks in the office are re-arranged, you can see that all the computers are on but none of them connect to any power point. NB: You can vaguely see that one of the computers is supposedly on Youtube while another is on Google Maps.