Continuity mistake: After being hit by the amnesia dart, Steed falls unconscious with his bowler hat still on his head. But when the enemy agent approaches and shoots him again, his hat is off and he's lying in a completely different position. (00:21:00)
The Avengers (1961)
1 continuity mistake in The Forget-Me-Knot - chronological order
Starring: Patrick Macnee
Man-Eater of Surrey Green - S4-E11
Revealing mistake: When Steed and Mrs Peel are fighting one another, the stunt doubles used bear absolutely no resemblance to the actors.