A Seattle receiver clearly made a catch and fumble with nothing but Steelers around to grab the ball and that was called an incomplete pass, that's A BIG one that went against the Steelers. The Seattle offender CLEARLY and OBVIOUSLY interefered, the holding call was correct. The Steelers had that EXACT SAME penalty called on them twice in the regular season (low block is the official thing, I disagree because in all three instances the low blocker was trying to get through another blocker and make a tackle but how they called it in the SB was consistent with how they called it in the regular season).
Officiating wasn't great, but it didn't take the game away from Seattle. Being 5 for 17 on 3rd down conversions took the game away from Seattle.
Cower could have reviewed that. You cant review holding.