Audio problem: When the deputy sheriff comes out of the house, her ink pen is sticking through the hole in her pocket flap but not in the pocket itself. After she turns around at the car, her ink pen is inside her pocket and not "flapping" loose as it was just a split second before.

Continuity: When Graham goes into Ray's kitchen you see the vegetables scattered and the knife further on the other side of them. When Graham leans up for the knife, however, it is on the other side of the now grouped vegetables.

Visible crew/equipment: In the scene where Graham and Reddy are talking at the side of Reddy's car window, Reddy speeds away and you can clearly see the reflection of the camera on the car and in the car's tinted windows.

Revealing: When Graham and Merrill board up the bedroom door there are some shots through the (closed) door. There is light on their faces coming from the left, where is only a wall and no light, as in all shots from behind.

Continuity: When Merrill takes the bat from the wall Graham is standing not far from him. When the camera angle changes Graham has disappeared from the set.

Continuity: In the scene where Merrill, Graham and the kids are returning home from town, and Morgan is holding his baby monitor to listen to the aliens, his fingernails are very long. When he gets out and climbs on top of the car to get a better listen, his fingernails are very short.

Continuity: When Merrill delivers the final blow to the alien, you see it fall into a table and knock over a single glass of water from the alien's perspective. In the next shot, the top of the table is shown with three tipped glasses.

Continuity: When Graham comes back home from Ray's house Merrill and the kids are sitting on the sofa. Morgan's book on aliens is lying on the coffee table on top of another, bigger book, first diagonal, then, when the camera angle changes, straight.

Continuity: In the scene where Morgan is explaining what the aliens would do if they were hostile (when Morgan, Merrill, and Bo are wearing tin foil hats), Merrill is seen hugging his knees in a closeup shot. In the next shot, Merrill has his hands on top of his knees now, instead of hugging them.

Continuity: After the incident with Houdini, when Graham picks up Bo from the play house her right shoe is untied. When he is seen carrying her into the house the shoe is properly tied.

Continuity: When they first see the crop circle, Graham takes one step into the area, and the rest of his family crowds behind him, still basically in the corn. In the next shot (arial shot), supposedly right away, Graham is about ten steps into the circle, while Morgan and Merrill are about six or so.