The father tells the sheriff his address is 11575 Amanda Drive. 11575 is the number of the house next door that the alien invaders live in.
In the first scene when Steve uses is telekinetic powers to turn the doorknob, a crew member and lighting equipment is reflected in the turning doorknob.
When Ellen turns away from Scott and heads to her house a boom mike shadow is visible on the left side of the porch.
Alien invaders try to blend into a quiet American town by posing as a motorcycle gang.
When Scott and Ellen are sitting on a blanket in a park, when they leave they don't take the blanket.