It took two and a half years from HBO's booking of the play's navigation collection to its official launch. The crew reached a maximum of 583 people. During the filming of TV series, 251 extras were used on the most day. The whole drama was filmed for 171 days, including 133 days in Belfast, the capital of Northern Ireland, and 37 days in Malta, a Mediterranean island country. There are ***162 characters with lines in the whole play, and 17 people are the core characters (the names appear in the opening subtitles). Prop group * * * prepared 151 complete sets of armor. Prop group * * * prepared 131 helmets. There are about 81 people in the prop group, including fashion designers. The dining car with the theme of Game of Thrones stopped in the streets of new york and Los Angeles for 11 days, providing a "street meal" for the people who came here. All the delicious dishes sold by these food trucks come from the descriptions in the book, including: roasted rabbit, flavored roast duck, venison, lemon cake and so on. HBO's publicity materials * * * drew the genealogy map of six families. However, the hardcover version of the publicity materials has a small print run and is only available to the media peers, so it is extremely sought after. There are five naked women in the first episode (at least the upper body is bare). There are four beheading scenes in the first episode, three of which happened before the opening credits appeared. In the first episode, * * * mentioned "Winter is coming" three times, which is the core of the plot. There are two sex scenes in the first episode. The crew changed two regular actors: the one who played Catelyn Stark and the one who played Daniels Targaryen.