Continuity mistake: While talking in his kitchen, Tom's phone is sitting next to a glass that is by Hallie's arm. When he steps forward and it shows a close up of him reaching for the phone, suddenly it's moved over to the left a bit and turned crooked. (01:01:20)
Continuity mistake: After Chloe disappears, a boy stops Hallie and talks to her by a fence around a baseball field. In one shot the fence is unbroken behind her and they don't move from their spot, but a couple of shots later suddenly there is a gap in the fence behind Hallie. (00:44:45)
Continuity mistake: After Chloe runs off into the woods and the other two girls finally find her after she's had her run in with Slender Man, they are shining the flashlight in her eyes and asking her questions. In one shot her eyes are still open as she gazes near blankly off in the distance. When it cuts to a close up and suddenly her eyes are tightly squinted shut. (00:38:45)
Continuity mistake: In the basement when the girls are talking, one mentions to Chloe that she and Carl would make an adorable couple. Chloe's left arm is stretched up above her head in this shot. But in the next shot when she corrects her on the guy's name, it's suddenly down by her lap. (00:06:10)
Continuity mistake: Tom and Hallie are talking in his kitchen about Slender Man after she freaked out during them trying to have sex. He backs up against the island and his left arm goes up behind his back resting on the top of it as he's blurred in the background. The angle cuts to a wide shot and suddenly his arm is down at his side. (01:01:00)
