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.
The New Avengers (1976)
1 revealing mistake in season 1
Starring: Joanna Lumley, Patrick Macnee, Gareth Hunt
K is for Kill: The Tiger Awakes (1) - S2-E8
Visible crew/equipment: Steed is seen driving along with Purdey and Gambit in rural France. The camera was probably mounted on the front passenger side door, pointing in. As they near their destination, the camera pans to reveal a farm house, and as it pans, a professional-looking microphone can be seen sitting on the dashboard.