I was listening to their commentary for some of the second half, I heard Piper say the ref's assistant hadn't signalled a penalty. He definitely did, I saw him put the flag across his chest. If they haven't seen something, they should say they haven't seen it, rather than say it didn't happen.
But it was just one of a number of mistakes the commentators made that wouldn't have been noticed by those who weren't at the game.
One that should have been obvious to everyone though, was with 51½ minutes on the clock, Barber said "Hull are about to make a substitution 90 seconds into the second half". The twat must have been asleep for five minutes. Either that or he thinks the game lasts 100 minutes.