Mission... Highly Improbable - S5-E24
Continuity mistake: When Steed begins cutting Mrs. Peel's bonds, they're black straps. When he finishes sawing through them, however, they've turned into ropes. (00:42:00)
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.
Continuity mistake: When Mrs Peel is driving her friend the Major to Storping in the Swuff her top changes from a light purple colour to red a few times depending on the camera angle. (00:09:00)
You Have Just Been Murdered - S5-E21
Continuity mistake: The money boxes Steed is stacking at the end keep changing positions between shots. And though they're supposed to be full of half-penny coins, the ease with which he lifts and carries them makes it obvious that they're empty. (00:49:00)
The 50,000 Pound Breakfast - S5-E19
Continuity mistake: The clock showing London time is 12.15 when Emma is captured. Shortly after, the ticker timer goes off, it looks like almost 5 or 6 o'clock. But the ticker message is timed at 12.15. A short time later, after the escape, it shows 10.40.
Plot hole: The bad guy somehow knows what is going to happen (via the sketches) even though the events haven't happened yet, like knowing Mrs Peel was going to show up at Pool's mansion in that catsuit and hat, and that the scenes were going to play out like the sketches.
You Have Just Been Murdered - S5-E21
Continuity mistake: When Steed first spies the satchel full of money in Unwen's flat, the bills are stacked flat in horizontal piles. But in the next shot, the currency bundles are vertical and tilted at an angle. (00:36:50)
You Have Just Been Murdered - S5-E21
Visible crew/equipment: Studio lights and reflectors can be seen in the Rolls Royce's shiny side panels as it backs up and leaves the alley. (00:26:00)
Visible crew/equipment: When Steed and Lord Melford find the lift out of order, shadows of the boom rigging and microphone make two separate appearances on the wall above their heads.
Visible crew/equipment: As Emma is leaving Steed's apartment, the boom dips into the shot at the upper left. (00:04:30)
The Positive Negative Man - S5-E22
Continuity mistake: In the opening scene, Dr. Gray works at his drawing board while smoking a cigarette. From one shot to the next, as he looks up at the intruder, the cigarette disappears and he's smoking a pipe instead. (00:01:30)