Plays that shaped a season: No. 4

The Play: The hit to the head that wasn’t called.

The situation: The Browns trailed 13-3 and were in Steelers territory when Wiliam Gay gave Jason Campbell a concussion with a hit to the head -- with no flag thrown.

The reason it mattered: The play led to a turnover and fumble return to the Browns' 5. When Pittsburgh scored a play later, the Steelers led 20-3 and a route was on. A penalty and first down would have given the Browns a chance to get back in the game. The league admitted this no-call was a mistake, just like it did the pass interference penalty on Leon McFadden. It didn’t change the result, though.