Other mistake: When Molly introduces Nomi to Cristal backstage, Cristal is sitting at her dressing table and Nomi is standing a few good feet away. When Nomi runs out of the room after Cristal makes a rude remark, Cristal comments to Molly that Nomi has "nice nails"; however, it seems impossible that Cristal would've been able to see Nomi's nails from where she was sitting.
Other mistake: When Apollo 13 lifts off, you hear a voice saying something like 'Houston we have cleared the tower at 13:13'. However, when this is said the Saturn V rocket has nowhere near cleared the tower.
Other mistake: At the beginning of one of the school years, there is a sign on the front of the school that says, "Welcome back Class of 1980". A few months later, in December of that same school year, John Lennon is murdered. Since that class is graduating the following spring, the sign should have read "Welcome back Class of 1981", not 1980.
Other mistake: While Joe is hanging onto a piece of wood, to stop himself from falling into the very deep disused empty well, the eclipse across the sun goes back and forth and back and forth and Dolores looks straight at the sun, which she wouldn't be able to do for more than a second.
Other mistake: There are pictures of 4 year old Isaiah on Margaret's desk in her office at a point in the movie when he was still a newborn. (00:15:59)
Other mistake: At the end of the play, Arbuthnot picks up a newspaper in the dining room and reads an article with a headline about disappearing local people (referring to those the graduates have killed). However, the actual body of text in the article is talking about politicians voting to halt construction of a new Hadron Collider.
Other mistake: When Malagant visits the Round Table, he places his sword at his old position but never retrieves it before he leaves.
Suggested correction: Near the start of the film, when Malagant and his men kill villagers and burn the border village, Malagant wields his current distinctive sword with its long serrated edge. So when Malagant places his own old "Knights" sword (all Knights of the Round Table have identical swords) at his past position on the table, Malagant effectively renounces his former seat at King Arthur's Round Table. Prince Malagant has absolutely no intention of retrieving that sword when he exits.