After all the talk over the years about how bad and foul smelling his wellies are, Compo has some clean, white socks on, as seen at the end of the experiment on the ladder. If the wellies are as bad as they seem, the socks should have picked up some grime.
Just after Compo steals a kiss from Nora, the boom mic briefly drops into the top right of the frame.
The lights for the cameras are reflected in Edie's television. Also seen are the tops of the walls, up to where there is no ceiling.
While the ladies are having tea and the camera is focused on Pearl, right after she mentions a fertilized egg, someone is seen reflected in the glass door of the hutch behind her.