If the final play of the game was for a first down somewhere in the middle of the 2H, it would have been called pass interference on Ravens.....like the pass interference call on he SF Niners when Balt drove for winning score in the 2H.
Apparently there was a more obvious holding call on the last play not called on the Ravens away from the pass attempt to Crabtree... ESPN showed it this morning.
NFL Super Bowl Officials swallow their whistles in crunch time more than NHL officials in the Stanley Cup finals.