Revealing mistake: A minute or so after the health and fitness instructer dies, we see her lying flat out on her back. If you look carefully, you can see her chest moving up and down and breathing despite being dead. (00:13:05)
Suggested correction: If you actually watch the whole episode you will find she didn't die at all.
Talking rubbish I think, she did die. Maybe you're confusing her with the old lady who fainted?
At what point in the show did they reveal the instructor didn't die? It was the old lady who had just fainted.
I'm a big fan of this comedy and have probably watched each episode 20 times! I struggle to recall any mention of the fitness instructor not being dead.
We Have Put Her Living in the Tomb - S2-E2
Revealing mistake: When Victor and Margaret arrive back from her goddaughter's, they find their new wallpaper has been stripped. Margaret then goes up the stairs to bed and through the arch window you can see her stop at the top of the stairs waiting for the scene to end.
Revealing mistake: When Victor gets the glass stuck to his head, it's obvious there is a clear piece of plastic to stop the beer spilling out. This is obvious as it never goes past a certain point, but stops instantly.
Revealing mistake: At the start, the background of the country going by when on the train is very obviously a fake. It sticks out like a sore thumb.
Revealing mistake: When Alfred is at the station, you can see that the flames are superimposed.
Revealing mistake: At the very start of the episode, there is some rice with a mouse in. You can tell by the way it moves that it's a machine making it move.
The Pit and the Pendulum - S4-E1
Revealing mistake: The inside of the kitchen set doesn't match the external shot of the real location when looking at the inside of the kitchen door. The studio has a flat wall with green patterned wallpaper, where the real kitchen has a cupboard, white handles and the worktop directly next to the door side.
Revealing mistake: When Victor opens the front door to Mr Foskett and the boys, you can see that the background is actually a painting.
The Affair of the Hollow Lady - S5-E3
Revealing mistake: When Margaret hits the lady, it is very clear she dosen't actually touch her.
The Exterminating Angel - S5-E6
Revealing mistake: The scene with a bee in the Jag is superimposed.