When the glass shatters around Druse, you can see where they did several takes of the shot. The glass breaks at different points of the front pane on every take.
According to the newspaper found in Mary (Jodelle Ferland)'s doll, the Gates Falls Mill burned down on November 1st, 1869, All Soul's Day. All Soul's Day is on November 2nd, whereas November 1st is All Saint's Day.
The book that Carrie is reading in the sleep lab is My Lover's Bloody Pumpkin.