Visible crew/equipment: When Frasier is standing through his sunroof to speak with the drivers stuck behind him in the parking garage, one shot shows Frasier's body and much of the rear window which features a very clear reflection of the boom mic.
Continuity mistake: Roz is in her booth on the phone and the pencil on her clipboard changes position from shot to shot. (00:06:20)
Continuity mistake: Roz is in her booth and Kenny is talking to her. Her hair is hanging loosely in front of her ear but as Kenny says, "To hash out some rules", her hair is suddenly tucked behind her ear, even though she never touched it. (00:06:05)
Continuity mistake: Marty is working on a jigsaw puzzle and its box is sitting on the edge of the table. During the scene it rotates ninety degrees. (00:03:50)
Revealing mistake: When Frasier drives into and breaks the barrier at the parking garage, you can see that the barrier snaps very cleanly at an obviously pre-cut point.
Chosen answer: The turkey's stuffing.