Doctor Who (1963)

Terror of the Zygons - S13-E1

Revealing mistake: In episode four, when Caber breaks a piece off the Zygon equipment, the entire wall shakes.

Planet of Evil - S13-E2

Revealing mistake: In episode four, when Vishinsky and Sarah go into the storage room to get the force field generators, the plaque on the door flops around like the cardboard that it is.

Pyramids of Mars - S13-E3

Revealing mistake: The "crystal" tube holding Sarah wobbles whenever it is touched.

The Android Invasion - S13-E4

Revealing mistake: In order to save money filming the lift-off of Crayford's rocket from Oseidon, the producers decided to use stock footage of a Saturn 5 blast-off. Unfortunately, that meant the words "UNITED STATES" in large red lettering are seen on the side of the rocket...which is a little bit of a giveaway, especially as the rocket is supposed to be a BRITISH space probe.

The Brain of Morbius - S13-E5

Revealing mistake: When the Morbius creature falls over the cliff, he bumps into the camera.

The Seeds of Doom - S13-E6

Revealing mistake: The fake snow in episodes one and two is effective - with the exception of when the Doctor is digging up the second Krynoid pod, where it is painfully obvious the snow is styrofoam packing peanuts.