Goofs

When Nathan Bryce is in bed with young co-ed, the bra comes off then reappears and then goes through a series of out of sequence appearance.

When Newton lifts up the cookies in the desperate moment before the transformation, there were only twelve cookies on the plate, then, when they were shuffling in the air, it's easily possible to count at least sixteen of it.

During the first sex scene between Nathan Bryce and his student, her bra keeps changing from partially off to on to completely off to on again.

Newton only touches the plate once and there's only one plate of cookies, but when they were in the air, we can see two completely different lifting moments.

Near the beginning when Newton crouches down to fill his cup with water he does so from a stream which appears to be about 6 feet wide.

When he stands up the stream has changed into a much larger river.

The blanks that Newton and Mary-Lou fire at each other for fun, don't seem to have any effect. In reality, blanks can cause serious injury, especially when fired at such close range. (In the making of the film, they probably used a special theatre gun, which doesn't emit anything at all. Or the gun was unloaded and the sound and smoke were added later. Anyway, in the story, it's a real gun loaded with blanks.)

When Newton is in the shed watching a television set on a pile of fire wood the analog input dial is clearly set to "LINE" and not "TV." This reveals the content being displayed is a recording controlled by the filmmakers and not broadcast television.

Towards the end of the movie, Newton walks through a long, saloon-like room while the camera pans back. A lamp at the upper right part of the screen moves, probably touched by the camera crew.

There is no reason why an alien would choose two different eye 'covers' unless he deliberately wanted to resemble someone with anisocoria.

At the end of the film, it is implied that 20 to 30 years have passed, yet the fashion, technology, and general appearance of the world is still clearly in the mid 1970s.

During the last scene, as Newton talks to Bryce, the crew can be seen reflected in Newton's sunglasses.

When Newton opens the cabinet mirror in the bathroom we can briefly see the reflection of a crew member.

When Mary-Lou takes Thomas to the hotel's fifth floor in the elevator instead of allowing him to use the stairs, she says, "It's five flights." This would be correct in the UK, but not in America; from the ground floor to the fifth floor of an American building is four flights.

Mary Lou refers to light years as if they were a measure of time. They are of course a measure of how much distance light travels in one year.