Men Behaving Badly (1992)

Jealousy - S6-E3

Plot hole: In this episode, we learn that Gary has never learnt to drive, and crashes when he attempts to do so. However, he is seen driving to the chemists back in series 3, Episode 2 ('Bed').

Intruders - S1-E1

Deliberate mistake: In the first episode, Dorothy's name badge on her nurses uniform reads 'Dorothy Martin'. However, by the 5th series her name has inexplicably changed to 'Dorothy Bishop'.

Ten - S6-E5

Revealing mistake: When Tony falls down the stairs, he lands on a mattress - the other end of it is visible on the floor. (00:12:50)

Triviani

Gary and Tony - S2-E1

Trivia: When Dorothy is walking into the pub to meet Gary, she walks past a brewery sign. The owners are Newton and Ridley, the brewery from Coronation Street.

George: Y'know, I think marriage is tremendous.
Gary Strang: I hate to be cynical George, but you think Croydon is tremendous.

Gary Strang: Bed? Beds are for sleepy people! Let's get a kebab and go to a disco.

Tony: Why does Dorothy still live with her parents?
Gary Strang: Her Mother keeps threatening to kill herself if she moves out, I think she should risk it.