There are too many to name. If you really want to know buy the book Football for dummies. I know a few parents who did and realized there is much much more to football then just players running around and hitting each other.

IDK i'll name some i know.

Offsides, aproachment, Pass interference(d-fense),pass interference(offence)
facemask,holding,clipping,roughing the kicker, roughing the passer, illegal kickoff,intentoinal grounding,delay of game,12 men,too much celebration,arguing with ref, WAY TOO MANY TOO LIST