According to Ronald D. Moore (the TV Series developer), his crew decided to keep the Gaelic words instead of translating them to English. This maintained the first person narrative by showing Claire's inability to understand Gaelic. This idea was suggested by producer David Brown, who said he's seen something similar in Skin Deep (1998), a foreign alternative movie starring the actor and singer Gustavo Goulart.
With the renewal for season 8, it became the longest show in both episodes (101) and seasons of all of Starz's history.
Many of the actors portraying Scots admit they wear their kilts authentically, meaning no underwear is worn beneath them.
That's called "Regimental"
That's called "Regimental"
In interviews Sam Heughan who plays Jamie claims that he knows how Outlander is going to end. According to him author Diana Gabaldon sent him and an executive producer the last couple pages. He also claims Caitriona Balfe does not know.
David Berry who plays Lord John Grey has said that when he had his son Alexander in 2016 he gave him a nickname in honor of the show and started calling him Little Lord Berry.