There are several scenes inside the couple's car showing rain splashing the windows but as soon as they get out of the car it's sunny and dry.
In the scene just before Burton hits the boy we see Vicki sitting bare feet in the car. In the next scene Vicki opens the door to run to the injured boy having her shoes on. To put on the shoes would be impossible that fast especially because Vicki's shoes have to be tied up.
When Burt comes from the cornfield the car window is down,when he drives away the window is instantly up.
Just after the fertilization scene, there is a scene with Burt falling in the cornfield exhausted, and he starts having flashbacks of all the things he's witnessed and done in the film so far. He sees a flashback of the Blue Man, but he hasn't even been made aware that there even IS a Blue Man, let alone seen him to be able to experience a flashback of him.
When the runaway kid is hit and killed on the road he is hit with the passenger side of the vehicle. After they arrive in town the drivers side is damaged and has the blood on it.
You can't put holes in the gas tank by punching holes in the fenders.
He took the keys away from her - so how did she close the electric windows when he went into the church? You can clearly hear the power windows going up.
The children kill all the adults in town. Twelve years pass. The town still has children under the age of twelve years. And, this is because new children have been born to teenage mothers belonging to the cult of the spirit "who walks behind the rows" in the corn.
When Burton is attempting to tune in a station on his stock AM radio, a station comes in loud and clear with the creepy broadcast. He looks out the window and the view is of - not a longwire AM antenna system, but rather a tower with FM repeaters.
Although the film is set in April, that month in Nebraska is still rather cool. The protagonists are dressed like it is late spring or even summer (short sleeves and no jackets) and yet no one makes mention of the outside temperature which can't be warmer than the low 60s.
If the town where the transport the child they struck to is abandoned except for the children, who maintains the roads and the rest of the infrastructure? They are shown to be in pristine condition, which should not be possible with a complex network of workers and material purchases.
Leo Howard (Additional Voices)
is credited as Leo Howrad.
Just after Burt and Vicky finish examining the dead boy's case, there is a scene with the Preacher Boy giving a sermon in the cornfield. He is standing in front of the congregation with the dead Blue Man over his right shoulder. When he eventually references the Blue Man, the congregation turn to their right to look towards his corpse. As they are facing the Preacher Boy, they should turn to their left rather than their right.
It would have been next to impossible for the children to have remain undiscovered in the town for twelve years. In addition to the problems mentioned in the film itself (the utility companies and the state police), when the adults stopped paying taxes both the federal and state tax authorities would surely have investigated. Unpaid county fees such as property taxes, farming, and municipal fees would also have been investigated by local authorities. Also, being an incorporated town on a map, Gatlin would have definitely been visited by federal census takers for the 1970 federal census.
The children have no access to farm equipment, yet it is clear that the corn which is shown was planted by machinery and not by hand.
When searching for Burt in the field, Malachai warns Nahum to never stay in the corn after dark. After the fertilization ceremony however, Malachai and several other boys enter the field at night despite his own warnings.