When Sara the realtor returns to the house and comes inside, her hair is parted on her left for about two shots. For the third shot, just as she is moving to go up the stairs, her hair is now parted on the right.
When Simon takes out the piece of glass from Sara's mouth he cuts himself and he has blood on his fingers. After he removes the glass the blood from his first and second finger vanishes.
When Sara arrives for the first time at the house he has a conversation with Tom and we see Greg behind him with his hands near his body. In the next shot he has his hands cross and in the next shot his hands are back near his body.