Continuity mistake: When Purdey is talking to Steed through the window of his hotel room, her hand positions change between the exterior and interior shots. (00:33:40)
The Last of the Cybernauts ...?? - S1-E3
Continuity mistake: At the start, Kane crashes an Austin Westminster - the burnt out wreck seen in his lair is a Wolseley 6/99.
The Last of the Cybernauts ...?? - S1-E3
Continuity mistake: During the car chase in the car-park, Kane's contact crashes into a purple Hillman which reappears undamaged later in the scene.
The Last of the Cybernauts ...?? - S1-E3
Audio problem: During the opening scene when the cast are gathered around the piano singing "Happy Birthday" to John Steed, his voice is audible as a part of the singing from the start, but he doesn't start singing until the second line.
The Last of the Cybernauts ...?? - S1-E3
Factual error: When Kane pushes the Range Rover into Gambit, the hand print in the Range Rover's boot looks more like it was made in clay, not the steel panel of a car (which would have simply dented).
Continuity mistake: The yellow Aston Martin DBS that Gambit and Purdey give chase to at 0:09:45 transforms itself into a yellow Audi 100 Coupe at 00:15:00. Also the "P" registration mark (1975-6) on the Aston is incorrect as the marque had been discontinued in 1972.
Cat Amongst the Pigeons - S1-E5
Visible crew/equipment: When Purdey runs to Steed's front door after finding the 'Sanctuary of Wings' ring, the boom mike appears in the bottom left of frame as she calls after Steed.
Cat Amongst the Pigeons - S1-E5
Continuity mistake: When Purdey and Gambit are escorting Rydercroft from his plane, the registration number is ATUC. Later, when he gets back into the plane to take off, the registration number is G-ATPN.
The Tale of the Big Why - S1-E8
Visible crew/equipment: When Gambit is on the wing of Turner's plane, there is a close-up of Turner where a crewmember is visible in the background.
The Tale of the Big Why - S1-E8
Revealing mistake: When Gambit is just about to shoot off Steed's door handle, the 'marble' column behind him wobbles visibly.
Continuity mistake: During the snooker game between Steed and Gambit, Steed plays right-handed but in the close-ups of the trick shots, the cue is held left-handed.