Continuity mistake: After the kids are told Sara hung herself at the hospital, Chuck asks "what are they waiting for, let's go". Stella is bending down to pick up the book in one shot, but the angle cuts while Chuck is still saying the word "go" and suddenly he has vanished from the room as the other two start to leave.
Continuity mistake: When the kids are talking about the Red Room and looking up files of Sarah Bellows, a scene cuts to Chuck. In the background, it shows a mirror facing the door. Slowly, it closes without any of the kids or any adults touching it, and the kids are unfazed about it happening, like it isn't even happening.