Visible crew/equipment: When Martin is fighting the "puppy" at the door, you can see a crew member's hand pushing the doorknob open to portray the puppy is trying to get back into the room.
Sex, Drugs and Rockin' the Cradle - S3-E14
Visible crew/equipment: The tip of a boom mic is swinging in the upper left of the screen during a late scene between Amanda and Peter. (00:32:13)