Continuity: When the Sandy/demon tries the blow Rogers brains out he opens the bathroom door containing the 'floating garden tools'. The hedge cutter shoots towards Sandy/demon lopping off her head. Next scene Roger picks up the head placing it in a bin bag, but there's no blood, but there was when he shotgunned a hole in her from an earlier scene.

Continuity: When Roger returns from leaving his partner Ben who is captured by the Vietnam enemy, note the position in which Harold is holding the stoker object in his right hand whilst propped on the mattress, it moves from his stomach to his upper chest between cuts.

Revealing: Later into the film Roger realises that his aunt's paintings hold some significance to the whereabouts of his missing son. He removes a cloth from the top left of a painting revealing an image of his son trapped in his bathroom cabinet. Note the cabinet door is the wrong way round to the one in his bathroom.