Factual error: When the kids are getting hit from behind by the truck, cut to a side shot of them in the car, the boy's body moves forward, while the girl's body is more properly propelled in a backward motion relative to the car. This happens several times.
Factual error: When the Creeper eats the policeman's heart, there is nothing blocking the hole - the tissue above the heart should have collapsed downwards.
Factual error: When the Creeper takes Darry, they are on at least the second story of the building. However Trish can get out to the front of the police station in the time it takes the police to get from one side of the room to the other. (01:17:00)
Factual error: The cat lady shoots at the Creeper three times, with a double barrel shotgun.
Answer: Since the Creeper needs various body parts i.e. eyes to see, lungs to breathe, it would also need to eat the hearts of its victims for its own heart to keep beating. Or she could mean that the Creeper is essentially devoid of all emotions as it keeps attacking anybody that has the body parts that it needs to extend its own life.