Free for All - S1-E4
Continuity mistake: Throughout the episode, Number 6's lapels switch from having solid to broken white piping and back again.
A Time to Laugh, a Time to Cry - S3-E2
Continuity mistake: Manolito rushes into Don Sebastian's study, passing two large, open doors. When the shot cuts, he passes the same doors again.
Continuity mistake: David and Kathy exit to the outside of the building, closing the inside door and the outer door. When Sheriff Carver exits to the outside, the inner door is not closed, but open as he steps out.
Split Second to an Epitaph: Part 2 - S2-E3
Continuity mistake: When originally interviewed, Ironside holds up the police sketch. It is evident that it still is a bit rough as it has a line across the eyebrows. Later in the televised broadcast, the picture is completed, no roughness at all.
The Big Dog - S2-E11
Continuity mistake: As Joe and Bill take off to pursue the fleeing station wagon, Joe is talking to the mic in his right hand. When the camera cuts in for a close-up, it's in his left hand.
Continuity mistake: At the very end of the episode, where Captain Scarlet, Captain Blue and Lieutenant Green are about to enter the airlock, their recognition badges are gone. Once they are inside the XK3 rocket, the badges have returned.