Moving House - S3-E1
Revealing mistake: At the beginning when Frank is directing the vans, we see that one gets its windscreen broken by a ladder from another van. However, the glass breaks just before the ladder touches it.
The Illusion of the Lethal Playthings - S1-E20
Revealing mistake: The "remote control" model plane lands and sneaks through some bushes to spy on Blake. You can see the filament line pulling it. And the picture it sends the bad guys with its mini-camera not only zooms in (unlikely technology in 1973), it also delivers an unobstructed view when the plane is sitting in foliage that should block part of the shot. (00:21:50)
Revealing mistake: When Fletcher and Godper are assigned to the work party and they get locked into the church, one of the prisoners, Melvin (the hippy) leans against one of the 'stone' pillars of the church, causing it to wobble.
Revealing mistake: In the final scene when Foggy is on the horse, it rears up when frightened by Foggy's bleeper, causing Clegg to jump out of the way. It's obvious that it is a stunt double playing Clegg, as he has a different hair style.
The Likely Lads: A Special Christmas Edition - S3-E1
Revealing mistake: Bob and Terry go into the pub after Terry has passed his driving test, you can see the drinks they order are already poured out behind the bar, the barman puts the full glasses under the taps pretending to fill them before handing them to the lads.
Revealing mistake: 44/34 Nick Newman is hit from behind and knocked unconscious. However, he bows his head and braces for the blow before he is hit. (00:48:00)
Revealing mistake: A citizen just reported the armed robbery. In an interior shot of the patrol car, supposedly fast driving down the streets of Manhattan, the pedals of the car are visible in the left part of The Frame; there's no foot on the accelerator. They filmed a close-up of the radio inside a still car. (00:02:35)