They were not trying to bring you earth shattering news by letting you know those three things were in the game. Not everything is meant to be earth shattering news. They were just being nice and letting you know that they made some changes to make things look more realistic.
I am not sure how often signs are used at NFL games. They are something I more associate with like WWE but foam fingers and females are in real life NFL audiences so they deserve a place in the games audience. That's all there is to it. Does not have to be earth shattering to be real.

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