Interesting quote (emphasis mine):
Offsides is not a reviewable play," said the spokesperson. "Dennis Hennigan (ACC director of officiating) said that mechanically the officials were in the correct position. The rule as it relates to to an onside kick that the 35-yard line is treated as a plane and if any part of a player breaks that plane before the ball is kicked it's offsides. The officials saw a member of the kicking team break the plane before the ball was kicked.
Fans react to controversial call in ACC Championship | abc11.com
Is there such an interpretation regarding onside kicks? If your index finger breaks the plane it is offsides?