Actor Allusion: This isn't the only time Jeremy Irons played a character who killed one of the main character's fathers. However, given what that father was like, not to mention what he did to his dragon, Brom pretty much had a very good reason for doing so. He's also seems to be looking to bring about the death of the king, again.
Enforced Method Acting: Eragon's surprise when Brom comes up behind him when Eragon is looking through Brom's books for information about dragons.
Stillborn Franchise: The movie was a critical failure and a financial disappointment. It also made it impossible to create a film of the second book due to discontinuity created by the first film, not to mention the number of ignored characters that would need to be introduced.