Continuity mistake: When Danny and Derek are taking down the Nazi-posters in Danny's room, the big poster above the computer is a very large Nazi flag that takes up about one fifth of the entire wall. During one of the shots in which all other smaller posters are being taken down, it is not there, and then it reappears and is the last one they take down.
American History X (1998)
Ending / spoiler
Directed by: Tony Kaye
Starring: Edward Norton, Edward Furlong, Ethan Suplee, Elliott Gould, Beverly D'Angelo, Fairuza Balk, Avery Brooks, Jennifer Lien
Danny is killed by the same black guy whose face he blew smoke in, in the bathroom. Derek has a sinking feeling something went wrong, and decides to go back to Danny's school. He finds his brother in the bathroom stall, bloodied, and holds him in his arm. A voiceover of Danny reads the conclusion of his paper, saying that despite being raised a racist, that "hate is baggage." Derek stays out of the D.O.C, from that moment on.
More mistakes in American History X
Murray: Derek, what are you trying to prove?
Trivia: Edward Norton drank purified tuna to bulk up for his role of Derek Vinyard.
Answer: The tattooed DOC on gang members' arms means Disciples of Christ - the gang that they belong to in the movie.