Other mistake: When the Demon has just ripped the tongue out of the police officers head, and he has eaten the tongue, when he is finished he puts the head in the back of his truck. Where on earth did his truck come from?
Revealing mistake: In the closeup of the demon monster you can see the contact in his eye.
Continuity mistake: After the demon crashes into Trish and Dari's car and drives them into the feild, it drives past on down the road. When it cuts to Trish and Dari getting out of the car, you can see behind them the demon driving past them AGAIN and going on down the road.
Other mistake: After the creature flies out the barred window with Darry, you see some bars missing from the earlier intact window, but where some of the bars are missing, there are intact bars surrounding it. The creature couldn't make a hole in two different places while flying out.
Continuity mistake: When they are in the dirt field one of them says, "Its getting dark." But in later scenes it is lighter and then it gets darker. This happens a few times.
Other mistake: When the guy with the stitched up chest dies, Darry starts walking back towards the pipe. In the next shot, it looks as if he's turning around and not walking towards the pipe. It was obviously taken from the previous shot before he saw the stitched up guy.
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.
Continuity mistake: When the Creeper bumps their car at the early stages of the film, the boy turns his head to the left to see the back. Then suddenly the camera angle shifts and we see him turn his head to the right this time to see the back, which of course he couldn't have done that quickly.
Continuity mistake: In an early shot, Trish is shown trying to shift a floor mounted manual transmission lever in their car. But you can see the automatic transmission level on the steering column, and it is also in the "park" position.
Continuity mistake: When Darry and Trish are in the police station and they meet Jezelle, Darry and Jezelle are sitting down and Trish is standing in front of them. Trish's hair is covering her face in the wide shot, but when it cuts to a close-up, her hair is behind her ear.
Revealing mistake: During the final showdown, where the Creeper is holding Darry hostage, as the camera zooms in towards the Creeper's face when it is screaming intensely, you can see the nose and teeth of the actor underneath the make-up/suit.
Continuity mistake: After the cop's head is cut off, the cop car stops perpendicular to the road. When the girl approaches the car, it is nearly parallel to the road.
Other mistake: After the creeper cuts the cop's head off, how could the car both brake and steer?
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.