Visible crew/equipment: When 007 is on the "Little Nelly" and is about to fly over the village, there's a shot in front of him and you can see another helicopter in the background. This is not the helicopter that attacks Bond later - it must be the one used to film the action from behind.
Visible crew/equipment: When Mimi is escaping from the castle and swinging on the drain pipes, the wire holding the whole lot up is visible. (00:29:10)
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.
Suggested correction: How could you tell if the reflection showed the actual film crew and not just a TV and newsreel crew assembled for the scene? They were also using mounted cameras and carrying papers.
Visible crew/equipment: As Benjamin runs up to the church we see a crew member move something out of the camera's view in the lower left hand portion of the screen. (01:41:15)
Visible crew/equipment: After Lucifer talks to God and doesn't know what is happening and Saint Peter comes to escort him out they get into a discussion why he failed the entrance examination, you can see a reflection in glass between the camera and Lucifer and a man who does not appear to be St. Peter. (Maybe director Stanley Donen?) (01:39:25)
Visible crew/equipment: After explosion and the flour wagon runs driverless spilling the flour barrels you can see a man through an opening under the seat driving.
Visible crew/equipment: In the final scene, a boom mike shadow can be seen on the depot wall as Tibbs and Gillespie say their goodbyes.
Visible crew/equipment: When Brenda is waiting for Yvonne outside the cafe you can see the film crew reflected in the windows of two cars that go past.
Visible crew/equipment: When Paul is leaving the scrapyard in the blue van, as he turns round, you can see the camera lights reflected in the side of the van.
Visible crew/equipment: When Tom's father stands in his bedroom doorway on the day they are going on holiday to tell him that breakfast is ready there is a shadow of the mike on the wall above him.