As Hangman's House is burning with D'Arcy on the balcony, the shots of the conflagration appear to be done at night while Hogan's reaction shots are apparently shot in sunlight.
When the horses jump over some of the apparently dry stone walls, their feet knock into some of them. The impact causes the obviously inauthentic walls to move forward and fall back again.
When the big Irish hound comes into the room to go after D'Arcy, D'Arcy runs to the left while the hound runs to the right... obviously toward his off-camera trainer.