No offense to my brethren JasonTX but there are 3 exceptions for fouls committed in Extra Periods:
Of course the come under the heading of Fouls after a change of team possession
1. Penalties against either team are declined by rule in extra periods (Exceptions: Penalties for flagrant personal fouls, UNS conduct fouls, dead-ball personal fouls and live-ball fouls treated as dead-ball fouls are enforced on the succeeding play).
2. A score by a team committing a foul during the down is canceled.
3. If both teams foul during the down and Team B had not fouled before the change of possession, the fouls cancel and the down is not repeated.
I wasn't at the game nor have I talked to the crew, don't know who the crew is for that matter, however this is what they may have been thinking about in enforcing the penalty and messed it up because there was no change of possession. Whatever happened, it needs to be looked into.