When the two kids have run into the kitchen and the the raptors first come through the door, one of them leans to the side and you can see a hand grabbing the raptors tail to stop it from falling. It's really easy to notice if you look!
I can't see this hand, and further: this slip-up is almost certainly fake.
Why?
The scene in question does not use model raptors, it is CGI (Computer Generated). Why there would be a human hand in a CGI shot, I don't know...
Actually, the first post is correct. When the first raptor appears, and the camera moves from R to L revealing the position of the kids, you definitly see an arm pushing the tail of the raptor down. Just have to keep an eye on the tail.