Continuity: The writing on Ghost's sword early in the film has the Turisas rune (representing TH in Thunder) near the hilt, but later not only is a different font used but now the Dagalas rune (representing the D in sword) is at the hilt.
Great sites
Other: During the battle in the cavern, the (almost) bald Indian Warrior helping Ghost is stabbed by a Viking and dies in Ghost's hands. When Ghost kills the Viking and continues on, you can see the Indian Warrior still breathing. (Timecode refers to the European Extended Edition).
You may also like: Apocalypto | National Lampoon's Christmas Vacation | National Lampoon's Vacation | The Wizard of Oz | Twilight