Heavy Meddle - S2-E5
Continuity mistake: In the beginning of the episode, when Karen takes a Diet Coke from the refrigerator, she starts pouring it into a glass, and fills the glass halfway up. Cut to Jill for a second, then back to Karen, who is still pouring, but the glass is now only about a quarter full.
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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