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: 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)