The Bird Who Knew Too Much - S5-E5
Continuity mistake: When Mrs. Peel drives to Jordan's house, she parks in front of the house. When the assassin arrives shortly after, her car has disappeared.
The Avengers (1961)
1 continuity mistake in The Bird Who Knew Too Much - 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.