Far more often than you would think. The obvious ones are intentional grounding out of the pocket -- which doesn't exist in high school -- and thinking all personal fouls on the defense are automatic first down. A few others show up from time to time.How often do you have coaches actually not know the difference between NFHS rules vs. college or pro rules.
Not much anymore because the NFHS has put in a rule that it is not pass interference if the contact is obviously away from the direction of the pass.Do you ever get: It was uncatchable!!!