"The replacement referee working today’s 49ers-Vikings game didn’t know the rules about when a coach can challenge a call. According to the Associated Press, referee Ken Roan said after the game that he had mistakenly awarded 49ers coach Jim Harbaugh two challenges after Harbaugh called his final timeout. "
This is straight up cheating by Harbaugh. He knows the rules, he challenged the play then did it again because he got away with it the first time. If the Vikings would have lost this situation would be hitting defcon level 5 right now.