Other mistake: When Darry is in the basement under the church, Darry is laying on the floor surrounded by a circle of sunlight appearing through the pipe. Then follows a series of cuts between Trish at the open end of the pipe, and Darry. Why do we not see a silhouette of Trish on the floor rather than a perfect circle of light?
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?
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.
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.
Other mistake: After the creeper cuts the cop's head off, how could the car both brake and steer?
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.