You know the replacement referees are a debacle when a player gets injured on a dirty play that wasn't flagged, and no one notices because it wasn't even the worst uncalled dirty play of the quarter.
That honor goes to Pittsburgh's Ryan Mundy going helmet-to-helmet on Darius Heyward-Bey, requiring a neck brace and stretcher for Heyward-Bey. But later in the fourth, on what would be the Raiders' game-winning drive, Steelers DE Ziggy Hood was locked up with Oakland guard Mike Brisiel when his left knee was taken out from the side by tackle Willie Smith. The hit straddled the line between cut block and chop block, but the Steelers were immediately furious. LB Larry Foote began jawing with the refs, as did Hood as he was being helped off the field.