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: 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.