Continuity mistake: During the first few episodes the name of the painting changes from The Reclining Madonna to The Fallen Madonna.
Visible crew/equipment: When Herr instructs Helga to sit in the back room, a camera just peeps into shot on the screen right. (00:15:05)
Savile Row to the Rescue - S1-E4
Visible crew/equipment: When Rene catches Edith pouring some 'gin', a boom mic dips into view above them. (00:13:10)
Pigeon Post - S1-E3
Continuity mistake: The size of the paper Rene uses for the pigeon grows substantially when Herr Flick find it near the end of the episode. (00:19:45 - 00:29:20)
Pigeon Post - S1-E3
Visible crew/equipment: When Rene comes into the bedroom and finds the forger in bed with his mother-in-law, a boom shadow can be seen on the wall. (00:21:40)
Visible crew/equipment: When Michelle is speaking in the back room she leans over the table and says "Listen carefully..." when she does, the boom mic dips into view above her. (00:04:20)
Continuity mistake: When Rene comes upstairs to speak to Michelle, his hands and arms are covered in cement. However, when he arrives in the cafe from the basement his arms and hands are clean. Not enough time has elapsed for him to clean them all perfectly. (00:03:05)
Audio problem: When Rene comes upstairs to speak to Michelle the piano player in the background is out of sync with the music being played. (00:03:00)
Visible crew/equipment: At the start Rene send Maria upstairs. When he does so, the shadow of a boom mic can be seen moving over the wall of the fireplace. (00:01:20)
Up the Crick Without a Piddle - S7-E4
Visible crew/equipment: While Madam Fanny is rehearsing at the piano, behind her in the background, a woman comes down the stairs. It is not a waitress, and Rene and Edith are still in London.