Appointment in Palermo - S3-E21
Visible crew/equipment: Season 3, Episode 21, "Appointment in Palermo": When Gemma carries the dummy from the car to the storefront, the microphone shadow is visible following along above her at the top of the frame.
Continuity mistake: Season 2, "Good-bye, Harry": In Vancouver, while Greg and Sam stand on the street talking, Greg puts a coin into a gumball machine. He's still touching the dispenser when the shot cuts, but then he's abruptly several feet away from it. (00:47:50)