Alex Pettyfer was offered the role of Eragon, previous to the casting of Ed Speleers. Pettyfer said he had turned down the role partly because Eragon was filmed in Budapest and he's afraid of flying.
The final writing credits for the movie were not decided on until days before it was released, resulting in the posters crediting various combinations of Peter Buchman, Lawrence Konner, Mark Rosenthal and Jesse Wigutow for the screenplay. In the end, the WGA decided that Buchman alone should get the screenplay credit.
When Murtagh and Eragon are brought to Ajihad, Murtagh stays on Eragon's left for several camera angles and shots but when Eragon turns around to call in Saphira, Murtagh is on Eragon's right for the rest of the scene.
The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. Spoiler tags have been used sparingly in order to make the page more readable.
Q
Will the other novels be made into movies?
A
Most likely not. Fans of the novel series were very displeased at how the movie removed certain characters and plot lines which were considered key to the novels' success. As a result, Eragon received negative reviews and performed poorly at the box office, which resulted in investors pulling out, at which point all sequel plans were discontinued.
Q
What is Eragon about?
A
In a land ruled by an evil tyrant, Galbatorix (John Malkovich), a young farm boy named Eragon (Ed Speleers) goes hunting in a dark forest and finds an egg that hatches a dragon, who tells Eragon that he is the key to Galbatorix's downfall.