Game of Thrones

The showrunners David Benioff and D.B. Weiss said the production of the show is a massive undertaking. The production lasts the entire year and they shoot the show like a 10-hour movie. Season 5 alone was shot in 5 countries, on 151 sets, for 240 days, having 166 cast members, over 1,000 crew members and over 5,000 extras.

Carice van Houten (Melisandre) had previously been asked to audition for the role of Cersei Lannister but was unable to because she was filming 'Intruders'.

No character appears in every episode, and only three characters have appeared in every episode of a given season: Lena Headey (Cersei Lannister) and Jack Gleeson (Joffrey Baratheon) appeared in every episode of the first season, and Peter Dinklage (Tyrion Lannister) appeared in every episode of the second and fifth seasons.