Visible crew/equipment: On the train at the start, after everyone has left except Victor and Margret, you can see a boom operator reflected in the door's glass panel. You can see him and it's even more noticeable when he lowers the boom for when Victor sits down. (00:04:05)
Visible crew/equipment: When Victor and Margret are arguing at the door you can see the background is a sheet, and it moves at one point.
Visible crew/equipment: When Victor and Margret are arguing at the door, a stage light is just visible to the side of the door.
Suggested correction: No, this is not the case.
Only a Story - S5-E2
Visible crew/equipment: When Margaret is about to confront Victor with the truth about his reflexology, in the first shot that pans over to Margaret on the very left of the screen, a hand appears and pulls the door back. It can't be Jean as we see her leaving the room to go upstairs a few shots earlier.
Things Aren't Simple Anymore - S6-E6
Visible crew/equipment: While the song The end of the line is playing and as the credits appear on screen look at the back window of the Meldrews car, you can see the helicopter used for the high up scenes reflected in the glass.