Children of the Corn 4 - The Gathering

Some of the things I didn't understand:

First of all, this being part 4 of Children of The Corn, why didn't anyone seem to have the slightest idea what was going on, when all the children in that town (and there seem to be a lot for such a small village,) suddenly show the same symptoms. They think it's the 'flu???? (The only one who seems to have some idea, is the one who moves a fair bit because he seems to work for the army, and would probably not have been present when other events had happened, the father of the hemophiliac.)

This one is a continuity issue, I guess: The farmer who went into the barn very early in this movie and got killed, had his head cut off, etc. - the black boy gave the Sheriff his head as well - in the end his whole corpse is 'sitting' in the barn. (It looks as if at first sight the Medical Student thinks he's alive.)

The mother: she leaves the house, passes the 'threshold', the end of the path only to drive to a deserted place, the barn. If she takes steps she hasn't dared to take for years, gets into a car, why doesn't she go to a public place, e. g. the Doctor's practice where her daughter (and as she doesn't know that he won't be there, her Dr.) and patients she's bound to know are going to be?

Ridiculous that the undead, evil ex-Preacher with all his history and background would be defeated by some water.