The Long And Winding Road (3) - S8-E27
Continuity mistake: At the end of the episode, when Tim and Jill are cleaning up from the wedding, you can see where the fence was. There is a seam where the two grass carpets meet up, showing obviously artificial grass since the holes are so neat and thin and perfect, with no displaced dirt. You can even see that it is laid down in strips on Wilson's side, with multiple seams running towards the house.
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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