(at around 1h 1 min) When he's first introduced, the amount of icing on Tucker's cupcake changes between shots. Additionally, he finishes eating it before it briefly re-appears in another shot, and he eats it again.
(at around 28 mins) During one scene, Quinn's wicker chair is facing towards her as she sits in bed, but as the scene progresses, it goes from facing her, to facing her door, to facing the wall.
(at around 36 mins) When Elise finds her reading room unlocked she attempts to turn on the light by pulling a cord. However when she shines the flashlight down the stairs, a light switch is clearly visible on the wall.
(at around 29 mins) When Quinn knocks on her wall and supposedly Hector returns the knock, Quinn texts him asking if she woke him up. He replies with "I'm not home...". This implies that he already knows that she had knocked on the wall, but Quinn gave no indication that she had done that. His reply should have simply been "no", but of course that would break the story line.
(at around 1h 9 mins) Emily broke the casts off both of her legs and stepped on them causing severe damage yet when she wakes from her trance (at around 1h 25 mins) she shows no signs of pain or even that it happened.