During the three way chase between Nadine, Mr. Johnson, and the cops it switches from night to day several times.
When Traci is toweling off after her shower, she is wearing black pumps. Then in the next shot, she is barefoot.
In the shower scene where Traci is toweling off, in the mirror, she is wearing black pumps, then in the next view she is suddenly barefooted.
Nadine pulls up to Mr. Johnson's house in the afternoon. When Jeremy answers the door for her...it is night.
Camera and film crew visible in reflection on Nadine's boyfriend's black car door.
While Nadine is talking with the Doctor and her boyfriend in the driveway...Jeremy drives up. The shot changes to Jeremy getting out of the car and a crew member is visible in the door of the car before Jeremy opens it.
At the end of the movie when Nadine and Harry are at Mr. Johnson's grave, a boom mic is visible above their heads.
Throughout the film the Davanna aliens constantly and scientifically refer to human beings as "subhumans". A subhuman is a species other than and lower than human. If the aliens are meant to be using this term to imply that they feel that their species is superior to humans, than it would only make sense for them to call human beings sub-Davanna.
The doctor, @ 1:04:04, refers to Nadine (Traci) as 'Mary'.