Ye Olde Shoppe Teacher - S4-E10
Revealing mistake: In this episode, every time Wilson places a log on the block before splitting it, you can see a dark line on top of the log, showing where they were pre-cut.
Revealing mistake: When the hot rod is back in the garage covered in "snow" - look at the color of the car, along with the door when the door is open. There is plastic on the inside of the door (probably to get all of the snow off so quickly) and the color of the hot rod is a lighter shade of blue then normal.
Revealing mistake: At the end when Tim and Marty are outside Marty drops the ladder supposedly on Tim's foot, but it never lands close enough to his foot for Tim to get hurt.
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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