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.
When Simon breaks the glass with the case and presses his hand to the intact window, it is daylight outside. This scene is supposed to occur at night.
The small American flags stuck in the ground during the boy's baseball game in the park across the street from the 'Wicker Street' haunted house have 50 stars. The game is set in 1951, the flags should only have 48 stars as Alaska and Hawaii would not be admitted as states until 1959.
In the very beginning after the three boys are throwing/hitting the baseball, the shortest boy turns to get his book-bag and the tallest boy reacts, with his lips moving very quickly, but there is no sound.