Continuity mistake: In the opening segment, as Heidi hands Tim his hot-air gun, he takes it with both hands, then lets go with his left so he's only holding the gun in his right hand. The angle changes, and Tim is once again holding the gun with both hands, before he once again removes his left hand.
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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