Caitriona Balfe has stated that there was a scene she had trouble with. She had to fire a gun and fall and get back up. However she was very pregnant at the time and she had a hard time getting back up and had to do the scene several times before she was able to nail it.
The first episode of season six aired the day before Sophie Skelton and Tobias Menzies's birthdays and the last episode aired the day after Sam Heughan's 42 birthday.