I thought that was something that couldn't be reviewed?
Regardless of the specifics of that particular case, I think my major beef with instant replay is that too much isn't reviewable. The big deal from this year is the game between UConn adn someone last week. Crap - I can't remember who it was. But the punt returner raised his arm, caught the ball, and took advantage of the fact that the punt coverage team thought he was calling a fair catch. He scored a touchdown, and the final score was within 7 points. Apparently, it isn't reviewable.
Another problem I have is the coach's challenge. Supposedly, EVERY play is reviewed. Why, then, do the coaches get a challenge? If it's because the other team realizes there might be a challenge, so they try to snap before the booth can challenge, maybe the coach can stop the play, first. But it seems as if too many times the booth won't challenge because they think the coach should use a challenge.