Throughout the film we see peoples terrified faces and some of them are screaming.
We see people through the eyes of aliens as the aliens capture them and take their human form.
A man is trying to talk to some of his friends but they are really aliens in the form of his friends. They walk off into a door in an alley and he follows them. When he opens the door all we can see are there silhouettes staring back at him. It could be frightening for a very young audience.