1. Kit Harington didn't read the final scripts ahead of filming, only learning Jon Snow's fate when the cast gathered for the first table read. He wasn't the only one. Several cast members ended up in tears during the table read as they discovered their character's final destiny.
2. At the end of each script, there is a note summarising: "End of episode five" or "End of episode six". The final script for season eight read: "End of Game of Thrones."
3. Among the cast, it's acknowledged that Kit Harington had the worst role on the show because he was always filming in freezing climates.
4. Conleth Hill, who plays Lord Varys, originally read for the part of Robert Baratheon. That role went to Mark Addy but producers promised they'd bring Hill in for something else. At the time he thought: "Well that's bullshit, but it's nice bullshit."
5. Rory McCann (The Hound) hasn't watched all the episodes of Game of Thrones. He prefers to read the scripts and visualise the story in his head. He's waiting for a good dose of the flu to finally catch up.