So what EXACTLY were they saying? JF definitely shifts their D line and stunts LB's which is perfectly legal and they do give verbal signals, all perfectly legal. For the refs not to call it once on them even after the coaches told them about it, it's highly unlikely anything done was against the rules. The refs are right there, they can hear everything.
With that said, it was 100% Amherst being undisciplined. Even if JF was doing something to cause them to go, you would think after maybe the first time or two they would learn their lesson. I guarantee if you watch the tape you could find at least a dozen more times Amherst jumped with no flag, including the missed extra point attempt in OT.
Coach Christmas will do anything to win. He will use every advantage he can and take advantage of every weakness, but I've never seen him do anything close to illegal or unethical.
Dinwiddie shifts their defensive down linemen often, too. It's usually good for one or two penalties a game against the offensive line for movement. But, it's still hard to understand how Amherst could jump that many times. BTW, how long did it take to complete the game in regulation?