White out splatters onto a drawing, then in the next scene the white out splatter is shown again but it is in a different size and shape.
When Colin Childress runs into the hallway, he bumps the ax halfway off its rack, but when he grabs the ax to confront the demon, it is hanging completely back on the rack.
Whitney is shown several times drawing with an ink pen but the drawing is shown to be filled in with Screentone, though she never applies any and there is none on her desk.
When Amanda records Lisa she does so through a basement window. Later when watching the tape, the recording shows Lisa through different angle despite having been filmed only from one.