Factual error: Peter Townsend wears the rank insignia of a group captain (and is referred to as Group Captain Townsend) from the beginning of the series in 1947. In fact, Townsend was promoted from wing commander to group captain on 1 January 1953. He was also appointed Commander of the Royal Victorian Order (CVO) in 1947, but is never seen wearing the appropriate medal ribbon, which should come first on his collection.
The Crown (2016)
1 factual error in Season 1 generally
Starring: Matt Smith, Claire Foy, Vanessa Kirby, Victoria Hamilton
Continuity mistake: During the photo shoot, after Tony takes the final shot and tells Margaret to "get dressed", so he can show her his place, she is wearing a different blouse and different earrings when she comes upstairs to his apartment.