Mrs. Peel parks her car in front of Professor Jordan's house and gets out to go and find him. The next view of the front of the house shows Mrs. Peel's car to be missing from the shot.
The damage to the front of the building to Tom Savage's studio caused by the 'impact grenade' is not visible when Steed returns looking for Mrs Peel.
The street set outside the photographer studio has a stone wall outside the archway the first time, and a brick wall the second time.
The final shot of Steed and Mrs Peel reversing through a gatehouse is shown in reverse, as indicated by the movement of the smoke from the exhaust.
During the 'Mrs. Peel, we're needed' scene, the shot of Steed poking his head through Emma's window is shown in reverse, as made evident by the way her hair moves as she turns.
When the impact grenade explodes, the debris moves toward the explosion, not away from it.
The killers say they need an alibi for Emma's demise and set up an elaborate trap to be triggered later. But they didn't need an alibi, since there was no known connection with her. And the crime scene would include their device that could have been arranged at any time before the death, negating the alibi factor.
During the photoshoot with Steed and Sam, Tom Savage hits his head against one of his lights.
When Steed replaces Mark Pearson's pigeon back into its coop, he bashes it against the opening.