Character mistake: At the beginning of the movie, the German sub gets surprised and severely damaged by a destroyer. The sonar man first notices the enemy destroyer approaching, but only a short time before the destroyer is already literally on top of the sub. German sonar at the time had the capacity to detect ships up to more than 7 miles away, so the sonar man really had to be asleep at his sonar station not to notice the destroyer approaching. (00:03:40)
Suggested correction: He was in the sound room, not running sonar...given they were attacking a convoy, they wouldn't be running soar as that could be picked up by other ships.
Character mistake: When Maximus is talking to Marcus Aerelius, he mentions that his wife has black hair. But in the scenes where we see her, she actually has brown hair. (00:24:40)
Character mistake: Wilhelm Keitel was a field marshal, not an admiral as stated during the sentencing.
Character mistake: Patrick, being the music buff that he is, mistakenly claims that Huey Lewis' Fore! came out in 1987, when it was actually released in 1986.
Character mistake: When Barry and Rob are in the record store discussing Evil Dead 2, Barry makes a comment about someone offscreen making shotgun ammo in the 14th century. That plot point refers to "Army of Darkness" (the third installment the Evil Dead series), rather than Evil Dead 2.
Character mistake: Sam and Maurey were watching TV news coverage of Kennedy's assassination (11/22/63). When Petey got home (around 12:05 PM MST), he tried to change the channel, then said, "Mom, Maurey won't let me watch 'Rocky'." Laurabel/Mom said, "You know he watches 'Rocky' every afternoon." But school was let out early due to the assassination, so Petey would normally be in school at noon and therefore not be able to watch "Rocky" at that time in the afternoon. (00:21:30 - 00:23:17)
Character mistake: Juliette Simone praises Eva in an across-the-room exercise but calls her "Aiesha." That is the name of Zoe Saldana's dance double.
Character mistake: James Lear is described as a Sophomore Lit major in the first scene, and at the end of the movie at Word Fest as a Junior.
Character mistake: After learning by telephone that he would be part of the Monkees and making records and a TV series, Mike says, "Man, it's a win-win situation." That expression was not in use in 1965; it didn't become widely used until the early 1980s.