When pods attack Matthew and the others at Matthew's house, four bodies form in the yard, yet Nancy isn't asleep. She's shown wide awake, and she's the one who wakes the others when she goes outside and sees the bodies growing. If the pods can only attack when the human victim is asleep, there should have only been three bodies.
When Matthew Bennell is on the phone with the police, he reports that the accident which caused the death of Kevin McCarthy's character occurred at Leavenworth and Turk Streets. The accident actually occurred at Leavenworth and Eddy Streets, and both street signs are visible in the film.