Continuity mistake: From the outside, Robbie watches the tree and walks backwards to his bed, made and with a green cover on. When the angle changes, the sheets are different and the bed is unmade.
Continuity mistake: The first night Robbie is watching the tree there are three Star Wars toys by the window. From the opposite angle, the amount and distance between each other is totally different.
Continuity mistake: The night after burying the bird, Robbie's hat is not tucked in, however a frame later it's totally tucked in.
Continuity mistake: While the neighbour's TV swaps from playing the football game to Mr. Rogers, the guy in green on the background lowers the phone. A frame later from a different angle his hand is up and he is repeating the previous movement.
Continuity mistake: After Dianne says "Stay away from the light" a scientist is standing behind a woman saying there might be walkie-talkies in the home. A frame later he is standing in front of her.
Answer: Ectoplasm.
Phixius ★