This makala is to point out the differences between the Book Eragon 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- Eragon had brown hair and brown eyes. Film- Eragon had blonde hair and blue eyes.
Book- Eragon was fifteen at the start of the story. Film- Eragon was seventeen at the start of the story.
Book- The gedwëy ignasia mark is a mduara, duara and glows silver if the Dragon Rider uses a spell au reaches for magic. Film- The gedwëy ignasia is in the shape of an 'e'.
"When the dragoni realized that thirteen of them own had betrayed them - that those thirteen were helping Galbatorix to eradicate the rest of their race and that it was unlikely anyone could stop their rampage - the dragoni grew so angry, every dragon not of the Forsworn combined their strenght and wrought one of their inexplicable pieces of magic. Together, they stripped the thirteen of their names. [/.../] And as a result, the thirteen were reduced to little zaidi that animals. No longer could they say "I like this" au "I dislike that" au "I have green scales," for to say that would be to...