Visible crew/equipment: As Quatermass drives back to the spaceship in a cab, just before it is to be drilled, the film crew can be easily seen in the cab's windows. A woman with a white cap can be seen holding a script. Later when the police use a megaphone on their car to announce the spaceship is a hoax, you can again see the same woman with a white cap in one of the windows of the police car.

Revealing: A skeleton of early man is found by a workman digging through mud at an extension to the Underground railway system in London. The skeleton, however, shows no mud inside the rib cage or other body cavities.

Revealing: The flashlight that the drillman used when the lights went out around the spaceship didn't match the light from the spot used by the film crew.

Continuity: The martians that were pulled out of the spaceship had compound eyes much like a fly. However, the lifeforce of the martian over London, had cross-eyed pupils.

Continuity: The man who was electrocuted and killed inside the hull of the spaceship is carried on a board and is laid down on the platform, just after Quatermass says "He's dead" he covers the dead man with a sheet that magically appears from nowhere between shots.

Visible crew/equipment: As the drillman was removing his equipment from within the spacecraft, the gravity became nonexistent and all the tools began to float. You can easily see wires on all the tools - especially the flashlight.

Continuity: At the beginning of the film when the first skull is found, the black workman is holding a cigarette in his right hand when he tosses the skull to the foreman: The next shot cuts in and the foreman says "It may be worth money" the cigarette is now in the left hand of the black workman.

Continuity: A borazon drill was used to cut a hole into a panel. The hole was rather large, but when the special effects began showing the panel dissolving, the hole was much smaller.

Visible crew/equipment: From the first shot, the flashing yellow crossing beacons on Hobbs Lane are powered by cables that lie in full view over the set pavements.

Continuity: Quatermass used tweezers to pull away the membrane covering the eye of a dead martian. A scene later, the membrane was intact.

Revealing: After the spaceship becomes alive and causes a cave-in, Barbara easily stumbles and moves the large chunks of broken cement beams as she leaves the pit with Quatermass.

Plot hole: When Quatermass is being admonished by the senior minister for talking to the press, Breen gives his own theory to explain the presence of the spaceship: He says that it was used a propaganda weapon in 1944 and that the figures inside were made up of scraps old skin and bone, why was he unable to explain how the hull of the spaceship was heat resistant up to 3,000 degrees and harder than diamond?