Scandinavia's most expensive film production ever.
There is at least seven languages spoken in the movie.
Swedish, Danish, Norwegian, English, French, Arabic and Latin.
Swedish Public Service (SVT) withdrew support from the project only months before its release, citing lack of quality and unsatisfying amount of material as main reasons. The studio (SF) instead claimed the disagreement was due to budget concerns. Rival broadcaster TV4 stepped in as co-financier.
The loom briefly seen at the end was an authentic loom from medieval times. It cost the production 300.000 Swedish crowns to transport from Germany to Sweden for use in the film.
The movie/series Arn: The Knight Templar contains several historical errors - for example is an all female choir seen in the first part or ep. 1, whereas a young Arn Magnusson (Joakim Natterqvist) first spots the love of his life Cecilia (Sofia Helin) in a Church choir. The historical problem is that the Roman Catholic Church had no female ensambles until maybe late mideval times in Europe or the Nordic countries. Choirs consisted of men or, in the 12th Century, boys who were able to sing in a higher tone than grown men.