There were two where White and Wallace had great position but couldn't finish it. Steelers WRs made the play. I assume he's talking about those too.
Then of course the deep pass Allen missed. He also missed seeing Sanders wide open deep and threw it to a covered receiver instead.
Then there was a few drops by the receivers. One by Beasley on 3rd down that would've moved the chains. Another by Sanders that he caught, but the Steelers defender hit it out, which would've been a first down.