This 記事 is to point out the differences between the Book エラゴン and the Film Eragon, which was a great disappointment to many fans, including me. So here we go, my information is from the InheriWiki.
Book- エラゴン had brown hair and brown eyes.
Film- エラゴン had blonde hair and blue eyes.
Book- エラゴン was fifteen at the start of the story.
Film- エラゴン was seventeen at the start of the story.
Book- The gedwëy ignasia mark is a サークル, 円 and glows silver if the Dragon Rider uses a spell または reaches for magic.
Film- The gedwëy ignasia is in the shape of an 'e'.
Book- Zar'roc has a ゴールド pommel with...