A lot is being made about the bolded point, but numerous former players have said that defensive players often ignore or miss the specifics of what the refs tell them in terms of ineligibility or eligibility of linemen prior to each play. This is just the sort of routine interaction that can get easily overlooked by players in the moment. So the idea that Campbell's attempt to fool them offered 0 benefit is wrong. They're not playing a sterile environment where hearing is at an optimum, and additionally, half of the players are just paying attention to who does and doesnt come on the field so there was obviously a purpose in Campbell attempting to cause confusion. He knows how little attention players typically pay to these sorts of machinations. He even went so far as to go over the mechanics of this with the refs prior to the game so that they would get it right, and this trash crew still got it wrong. All that being said, the tripping call was a 30 yard penalty that kept Detroit in the game just as much, if not more, than McCarthy's game management antics. So ultimately it all came out in the wash and the right team won in the end.