Goofs

The same cluster of vehicles is seen following the titular characters on both the outward and return journeys to Monty's cottage.

While driving to Cumbria, the car only has one headlamp, however at one point the camera shows the road ahead, and two beams of light show up on the road ahead.

When Marwood is seen knocking at the Penrith cottage door looking for the farmer, there is a distinctive black coal bucket outside. When the camera pans out before he leaves, the coal bucket is no longer there.

As the boys are driving OUT of London there is a light blue Ford Transit van. It is also there when they are driving BACK to London at the end of the film. Same number plate as well.

At 40:1, Withnail and I are in the Country, "I" is walking outside and it is raining. Next scene "I" walks inside the house and his jacket is completely dry.

On the drive to the cottage, there is a construction worker on the motorway who is working on the crash barrier. Parts of the barrier are lying in the outside lane which would have been extremely dangerous had it not been an unopen section of the M25 that they were filming on.

When Withnail and Marwood are driving along the motorway on the way to the cottage, at least one motorway construction vehicle can be seen driving in the same direction, but on the other carriageway. This gives away the fact that the motorway scenes were filmed on a completed but as yet unopened section of the M25 motorway.

When Marwood is in the bath shaving (just before Withnail arrives with his saveloy and chips), you can clearly see that below the shaving foam he is in fact already clean shaven.

The clock in the Camden pub is 11.25 am yet in the park (8 am) Withnail says that the pubs "won't be open for another four hours".

Several outdoor shots with rain only falling in the foreground.

Most pointers suggest the events of the film begin late Sept. 1969. However, the early scene in the park is shot in semi-darkness though it's meant to be 8 a.m. It would have been full daylight by that time. Also Withnail complains about the freezing temperature in flat as if it was midwinter.

The word "Provos" can be seen on the wall of the pub as Withnail and Marwood leave, however the Provisional IRA were only formed in December 1969 which is at least a couple of months after the film is set.

A road sign for the M25 London orbital motorway can be seen at one point as Withnail and Marwood are driving along the motorway on the way back from the cottage. This road was constructed in the 1980s, well after 1969, the year in which the film was set. The folded metal crash barrier is a thing of the late '70s at the earliest. Numerous cars dating from the 1980s are seen on the motorway.

Surmonti-50 (which was to be taken with a pork pie so they could "miss out Monday") was not available until 1980 or so.

When the lads are driving out of London - just after the 'Throw yourself into the road, darling!' bit - there's a tracking shot showing the Jag driving over a road junction. If you pause the film at this section, you'll see that the other cars on the junction are all very much late 1980s models. Escorts, Fiestas, Cortinas, etc.

When Withnail and Marwood run out of the Mother Black Cap pub, Trellick Tower is visible in the background (in the DVD commentary Bruce Robinson talks about he hated this building) but it wasn't completed until 1972, this film is set in 1969.

When Withnail puts his boots in the oven to dry, he opens the iron door with a stick because it will be hot. When he closes it, he uses his hand and doesn't even flinch.

Danny says admiringly to the long-haired Marwood, "You're lookin' very beautiful man, St Peter preached the epistles to the apostles lookin' like that." The epistles in the New Testament are the work of Paul, not Peter, and they aren't sermons.