Factual error: Sir Martin Charteris, depicted as being Private Secretary throughout the series (which begins in 1979), actually retired in 1977. Sir Philip Moore and Sir William Heseltine were the real Private Secretaries during this period.
The Crown (2016)
1 factual error in Season 4 generally - chronological order
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.