When Theo runs and jumps on the bed and does a filp head first, her head ends up at the head of the bed, if you do a head first flip on the bed, your head should end up at the foot of the bed.
Actually if you play it on slow motion you can clearly see that she doesn't get to do it right like you said, she just do sort of a turn. My sister made me the same point so I want to check it out and we realize it's not what it seem.
Think about it. Jones did the somersault and it wasn't edited. HOW do you think it's a slip-up? Watch it in slow motion. I thought the same thing but put it frame by frame and saw that she did some sort of twist which is how she landed the way she did. It's not slip-up. And to think things through, *why* would they edit and change something so trivial as jumping on a bed and landing? If they wanted her to land a certain way, it's easy enough to do *without* editing it.