In the church, Roderick has the head of Madeline's coffin, but while going down the stairs he has the foot of the coffin. In the next shot, entering the crypt, Roderick has the head of the coffin again.
When asked to remove his boots, Phillip sits down and starts to remove his right boot, but stops when he realizes Bristol has disappeared. He then stands up and walks away in socks.
Although Bristol has Philip remove his boots as soon as he arrives, and Roderick makes a big deal of it, Philip only has them off for the initial meeting. He has his boots on for the remainder of the film.
Early in the film, Winthrop leans with his hand on the banister, and the banister swings out precariously, nearly sending him to the floor below. When he pulls the banister back into place, he examines what appears to be sawdust on the top of it, in a very thick layer and showing no signs of disturbance from the near-fall or from his hand.
As Phillip leaves his room to go to supper you hear the house start to rumble and it shows the hallway shaking,you can tell that this is done by having the camera moved around as the candles and other miscellaneous items in the hall don't move at all.
When Philip Winthrop, on horseback, arrives at the Usher house, he dismounts and ties the reins to a post before knocking on the front door to gain entry. The horse is not seen again and even when Philip leaves the house by the front door at the end of the film, the horse is nowhere to be seen.
Roderick is shown playing a lute, but the sound we hear is a muted harpsichord.