As the truck runs over the scarecrow, we see in a wide shot that the scarecrow's legs are severed at the knees. Then when they show the scarecrow crawling on the ground, he is missing all of his legs, from the waist down.
After Mary sprains her ankle falling from the frat house, she is limping quite badly. When she walks off after destroying the Scarecrow, she is no longer limping.
Judy is in her hospital room when Carl and Mary come in. They look at the "artwork" on the wall and when this is shown, in the upper right corner of the screen, the top of the door can be seen opening then closing. This happens twice, but nobody else has come into the room.
As the teens use their truck to run down the scarecrow, just before impact, there is a distinct shadow of the cameraman and some kind of filming tower (for high angle shots) that appears across the truck as it drives by.
After the Scarecrow gets Gavin, Carl pulls up in the Blazer and picks up Mary and the Sheriff. After the Blazer pulls away at the left edge of the screen across the street is a camera sitting on a tripod, and the red light is even on.
After the Scarecrow David takes the pole away from Scarecrow Carl, the camera changes to a view from behind David. At his point there is a camera visible at the left edge of the screen.
Starting at 1:20:15, Mary is pushing the scarecrow with a pitchfork, at 1:20:17 she says "quarrel" in a hushed voice.