Despite not being involved in the production or credited for his work, Forgotten Realms creator Ed Greenwood loved the movie, saying it was a film that D&D fans could be proud of without having to defend the game to non-fans, and he even mentioned that he planned on seeing it multiple times. He was also happy to see his creation adapted faithfully on the big screen.
Chris Pine agreed to appear because the role of Edgin is very atypical for a fantasy-film leading man and because he sat in on his nephew playing a D&D campaign and saw how much fun he and his friends were having.
The scene where Xenk leaves the party on the beach, walking away in a straight line even over a rock, was caused by Regé-Jean Page not hearing "cut!" and continuing to walk away while staying in character, with Chris Pine ad-libbing as he watched.
The directors opened up about Monty Python's influence on the film, with Jonathan Goldstein explaining that while the creative team wanted to make a comedy, they didn't want to mock the source material. "We never want to go too far where it becomes a spoof of fantasy films, but we also wanted to be able to pivot from something creepy and traditional fantasy to an absurd, almost Monty Python-type sequence," the director said.
All the spells used in the film, while largely unnamed, are all spells used in the Dungeons & Dragons tabletop RPG.