Continuity mistake: When the doctor is testing Oliver's lung capacity with a large balloon, the balloon bursts and Stan is sitting on a chair which overturns. At this point, you can see there is lettering on the bottom of the chair, but in the next shot, the lettering has disappeared.
Continuity mistake: The electrical outlet beside the door explodes and falls off the wall when the doorbell is rung. A few minutes later, when Dr. Finlayson leaves, the outlet has replaced itself. (00:18:35)
Continuity mistake: Stan puts the half-folded newspaper down on the boat's galley table. One shot later, the paper is completely unfolded and covering the table. (00:46:05)
