Anachronisms: It is 1965, but 1970s cars are visible as they drive to the military entrance processing station.
Errors made by characters (possibly deliberate errors by the filmmakers): During the party scene a girl screams "Waxer, no!" when another character, Crusher, not Waxer, attacks her.
Anachronisms: During the 1962 party at Jack's house, his mother is reading the book 'Catch-22', a book first published in 1961. However, the copy she is reading is an edition that had not yet been printed. The photo of author Joseph Heller on the back of the jacket is clearly from years later than 1962.
Errors in geography: Right after the scene where Matt is talking to Bear on the pier the night before 'Big Wednesday', they show the sunrise of the next morning, with the sun just coming up over the horizon. The horizon, however, is the Pacific ocean, and if the sun was in that position, it would be setting, not rising.