Continuity mistake: About 10 minutes into the movie, when the truck is chasing the 2 college students in the car and starts ramming them, the bumper and the trunk is smashed in. The shot changes and shows the car's rear end and it is in perfect condition. This repeats at least 3 times.
Continuity mistake: When Darry falls down the pipe the ground is clear, and he walks about 10 steps to the body in the sheet. However the wrapped up body should have been at the bottom on the pipe, where the boy fell, unless the body was able to move 15 ft on its own.
Continuity mistake: The police station that they stop at is in a very out of the way rural community with only a few people in the jail. However, once the demon enters the jail and the alarm is sounded there are at least 20 cops on duty - all at the station in the middle of the night, in the middle of nowhere.
Continuity mistake: When Darry and Trish are being followed by the police car back to the Church, the demon rips his hand through the police car roof and cuts the cops head off. Yet a few seconds later when we see the car from above the police car roof is in perfect condition.
Continuity mistake: When the college students pull into the gas station their right tail light is out, but when they are being followed by the cops the left tail light is out.
Continuity mistake: When the main characters visit the house of the old woman with the cats, she comes out and aims at the monster with a double-barrelled shotgun, and fires one shot. Then when she goes back into the house, two shots can be heard in quick succession. She must have re-loaded the empty barrel quickly...
Continuity mistake: There are at least two different 1960 Chevys used in this film. There is a noticeable difference in the front bumpers. Notice the front bumper area just below the headlights. The first car used has a plain straight bumper, the second one has little chrome trim riser mounted just below the center of the headlights. The second one first shows up at the cat lady's house. The lower tag pan also changes.
Continuity mistake: After the monster eats the cop's tongue, it's supposed to be the nighttime during the car scene, but the back window on the driver's side is rolled down and as the scenery goes by it is apparently broad daylight.
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.
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.
Continuity mistake: When the car is skidding out of control, it comes to a stop, camera changes and it comes to a stop again having rotated another 180 degrees. (00:43:40)
Continuity mistake: Darry walks towards the light at the end of the tunnel. He then has to turn round to look up the pipe. He shouldn't have to turn round as he was facing the pipe when walking towards it. (00:23:40)
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: There is one shot, just before we see Trish and Darry talking to the police, where the car is in mint condition despite being wrecked earlier. (00:35:45)
Continuity mistake: Darry falls into the church basement and has a rip in his shirt with a patch of dirt on his chest. Camera cuts to Trish and back and the dirt has gone. (00:19:30)
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.
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.
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.