Continuity mistake: When Bucky jumps on the hood of the bus to get back in, the Creeper flies from in front of the moon towards the bus causing all the kids to run away. Bucky can still be seen staying put on the hood when they run - however in the next shot of all the kids running you see him at the front of the pack which would have not been possible given that he didn't run right away.
Factual error: In the beginning of the movie, it states that every 23rd Spring, for 23 days it eats. I am no farmer, but isn't there that saying KNEE HIGH BY FORTH OF JULY? From the looks of that corn, it looks like it is October or even November...Definately NOT SPRING in TEXAS.
Deliberate mistake: When the Creeper gets stabbed throught the eye with the javelin, it goes through the front of his eye, but when it comes out the other end the eye is facing backward.
Revealing mistake: When the creeper has the pole through his eye and is pushing it in and out, the pole appears to be moving however there is a clear dot on the pole that stays where it is in relation to his face.
Continuity mistake: After Taggart shoots the creeper the first time, he says, "He's gonna rip my gun out of my truck!". After they jump out of the truck, it gets nearly totaled and the gun is ripped off. Later at the end, he shoots the creeper with the SAME truck and the same gun, as if he fixed his truck and re-welded the gun to his truck in seconds.
Factual error: When the kid is wrapped in the Creeper's wing and has his head ripped off, no blood comes out of the top of the body. With the body flailing around and a big hole like that, some blood should have come out, if not a massive amount.
Continuity mistake: Just after the man says 'he looks dead to me' (he means the Creeper) he walks past the girl who holds the black guy sitting/laying on the ground. The black guy is buried deep in her arms and he holds his right arm half over his face and on her left elbow. His fellow 'pupils' walk to him. Next shot: his fellow pupils walk to him, but now his right arm is lower, exposing his face and his right hand is now at his chin instead of on her left elbow.
Other mistake: When Coach Hanna catches the cheerleaders smoking, they turn around, caught off-guard, and have to hold in smoke in their mouths. After he turns away to get people back in the bus, they all blow out smoke and cough, even though they hadn't even inhaled any when they turned around.
Continuity mistake: When Izzy finds the javelins on the bus, Bucky is the only person at the front of the bus (because he is trying to call on the radio). In the next shot Scotty appears out of nowhere at the front of the bus and yells, "Sticks. You want to hang around here so that you can poke at this thing with STICKS?" with Bucky standing right next to him.
Plot hole: When everyone runs from the school bus, there are about 20 students running into the field, but when we see them again there are only 4 survivors running from the school bus. It is never explained what happened to the rest of the students.