You see Gabbie is holding the bedding as Harriet is talking about the ghost horse, in the next shot she isn't holding the bedding and her hands are together.
Later on in the movie, a secret seance room is discovered via blueprints and the room has a domed skylight. The same domed skylight is visible in the backyard, even more so when Ben talks to Travis in the backyard.
This is not necessarily a plot hole. It is plausible that the characters had not fully explored the entire mansion at that point in the film, which would explain why they had not yet noticed the room with the skylight or questioned its location relative to the rest of the mansion.
This is not necessarily a plot hole. It is plausible that the characters had not fully explored the entire mansion at that point in the film, which would explain why they had not yet noticed the room with the skylight or questioned its location relative to the rest of the mansion.
When they are reversing away from the mansion, no white back up lights are visible on the tail lights of the car.