Withnail & I (1987)

Factual error: When they are driving back home from the holiday cottage you can clearly see an M25 sign in the background. The M25 didn't exist in the 60s.

Withnail: Are you the farmer?
Marwood: Shut up, I'll deal with this.
Withnail: We've gone on holiday by mistake. We're in this cottage here. Are you the farmer?
Marwood: Stop saying that Withnail, of course he's the fucking farmer!

Trivia: The bottle of lighter fluid Withnail drinks had been filled with water throughout rehearsals, but for the actual take was filled with vinegar, unbeknownst to Richard E. Grant, who plays Withnail. The director made the switch to get a good reaction from him.

Jon Sandys ★

Question: At the pub in London, on Marwood returning from the toilet and saying "balls to Monty", Withnail says he's just spent an hour on the phone to Monty "flattering the bugger"? Surely Marwood wasn't in there for an hour and it's unlikely Withnail would have had time to phone Monty in the short while he surely must really have been in there, especially with a threatening guy sitting outside and likely to come in the longer he spent there.