Maybe, Baby - S3-E1
Revealing mistake: Whenever the door to the garage is opened the garage is not quite what it should be. It looks like there is a wall just inside the door.
Revealing mistake: After Tim talks to Wilson about his stalker, Jill is in the bedroom, talking to Marie on the phone. There is a small double picture frame on a nightstand. The photo on the left side, of Tim and Jill, is the same as a larger photo in another frame on the cabinet/dresser behind Jill.
Answer: In seasons 1 and 2, each Binford tool had a unique model number, but from season 3 onward, they were all numbered 6100 as a running gag.
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