(at around 55 mins) In the lab, just before the space object is drilled into, the lighting becomes substantially darker in the room between cuts (no doubt to increase the sense of fear), without anything to explain why.

In the beginning of the movie, 2 cops catch 2 burglars in the act. One of them gets away in a green car. When the car is being shot and is air bound it is a red car we see. When it lands and explodes, the car is green again.

After the creature's tendrils smother the first female victim, she is still heard screaming.

The cigarette the cop puts into the agent's gun butt end-out, ends up reversed when pictured in the gun.

In the beginning, when police firs, there are selective nuzzle flashes.

In the opening credits Ann Turkel's name is misspelled as "Anne".

A cop goes home and self-administers first aid to a gunshot wound, rather than going to a hospital.

Near the end, the star places the corrosive into the mouth of the beast - with his bare hand deep past the roach's teeth, without being bitten.

In the 48:40 minute you can clearly hear the account of the crew saying 20 ... 21 ...