Revealing mistake: Just before the dish explodes out of the dishwasher through the wall the cut out that was made to allow that to happen is visible.
Baby, It's Cold Outside - S1-E18
Revealing mistake: When Wilson and Tim start to talk they sit down on some rocks. If you look at Wilson's foot you can see the sheet of fake snow caught under his foot.
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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