14th Jan 2004
The Builders - S1-E2
Revealing mistake: In the scene where Polly brings Mr O'Reilly a cup of tea, it is obvious on several occasions that there is nothing at all in the cup. Not only does he hold it in such a way that you can see inside, but when Basil snatches it away nothing spills out.
2nd Jan 2004
The Germans - S1-E6
Revealing mistake: When Basil is turning the fire alarm on and off, he puts the key next to the red box and turns it. However, there isn't a slot for the key to actually go in; he's just holding it close and turning it.
2nd Jan 2004
Revealing mistake: There are noticable disparaties between the locations of rooms and the windows on the outside of the building. This is particularly noticable in this episode when Basil climbs a ladder to look through the window.