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.
Continuity mistake: When driving to Penrith, there is a shot of the road taken from the driving seat of the car. There are two headlight patterns on the road, but the car only has one headlight. (00:33:00)
Trivia: The lighter fluid scene was based on a real incident. Writer/ director, Bruce Robinson and actor Gregory Floy have both said that Vivian MacKerrell, the principal inspiration for Withnail, really did once drink lighter fluid. Gregory Floy also said that he walked round Regents Park in the pouring rain with Vivian, when he was due to go to the US for 6 months to appear in a play. Vivian was about to leave London and return to Nottingham and that it was very like the film's ending.
Barman: Time, gents, please.
Withnail: Alright, we're going to have to work quickly. A pair of quadruple whiskies and another pair of pints, please.
Withnail: I've some extremely distressing news.
Marwood: I don't want to hear it. I don't want to hear anything. Oh God, it's a nightmare, I tell you, it's a nightmare.
Withnail: We just ran out of wine. What are we gonna do about it?
Marwood: I don't know, I don't know. Oh God, I don't feel good. My thumbs have gone weird! I'm in the middle of a bloody overdose! Oh God. My heart's beating like a fucked clock! I feel dreadful, I feel really dreadful!
Withnail: So do I, so does everybody. Look at my tongue, it's wearing a yellow sock. Sit down for Christ's sake, what's the matter with you? Eat some sugar.
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.
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