Revealing mistake: When Henry is out on the balcony and Sara comes out carrying a bottle of beer, Henry is leaning with his elbows resting on a ledge. It can be seen that there is some kind of pad or cushion on there because you can see it give when he moves. When they sit the beer bottle down on there the sound effects of one touching stone or concrete can be heard. That should not be heard if the bottle touches the pad or cushion that is on there.
Continuity mistake: As Jessica pours cream into Henry's coffee, in one shot the level is right at the top of the cup. But in the next shot, the level has dropped.
Continuity mistake: In the scene where Henry is first learning to walk with the walker, he is in front of the table where he had been sitting. They show a shot of his feet, and there is only tile floor stretching behind him. He only took a few steps and the table (with the attached drawers beneath) should still be visible.