Visible crew/equipment: The very last scene, something swings in and out of the frame, on the right, just as Quartermass is rounding the corner.
Suggested correction: After viewing the scene frame by frame, it is clear that something grey and textured enters the edge of the shot from behind the wall for a few frames, but it is not identifiable. Given the turbulence of the disaster setting it could as easily be identified as a flapping wall poster or a piece of torn curtain as set crew or equipment.
I have studied the image frame by frame and you can see it is a right hand of someone, possibly a crew member not getting out of shot quick enough. The strange thing is that the hand is dark and hairy almost werewolf like. Obviously not a werewolf but maybe someone in makeup from another Hammer movie was visiting the set.
Other mistake: During the press conference, Dr Roney (James Donald) says they have only found parts of skulls and fragments of bone. However a nearly intact skeleton was uncovered by a workman in an earlier scene.
Factual error: Barbara takes an ancient document out of a filing cabinet. One of the words in its title is HIFTORIE, for "history." The old-fashioned way of writing the letter "s" was the so-called long s (ſ), not the letter "f", and this was only ever used as a lowercase letter. So the word would have been written as HISTORIE.
Character mistake: Colonel Breen theorises to Quatermass that the spaceship is an experimental German V-weapon from the second world war: However according to the story, the underground station (Hobbs End) was dug in 1927: The V-weapons first landed in London in 1944, so how was it possible for a V-weapon to land where it did underground, impacted soild in clay right next to a deep level underground railway station seventeen years later without anyone noticing at the time? Breen should realise that his theory makes no sense.
Visible crew/equipment: A gloved arm pulls out of the shot as Quatermass comes around the corner of Hobbs End to find a thoughtful Barbara. It is the very last scene of the film before the titles.
