In every game there are penalties called that aren't seen, or aren't obvious to the spectators. There are marginal calls which rely on the referee's judgement and may or may not result in a flag being thrown. It evens out over the course of the game, or over the course of a season.
However, there were a couple of plays last week, that made me wonder whether the refs were even watching the game.
The first was the Matthews fumble which, from my vantage point in the upper west stand looked like a pass that was batted down. Even if Matthews did not actually release the ball, it was quite clear that his arm was in a forward throwing motion and the play should have been called an incomplete pass. I am surprised that the fumble was not overturned by the TV refs - aren't they supposed to review all turnovers?
The second was the roughing call on the Banks fumble, which was given only after review. How could the refs on the field miss such a blatant illegal tackle to the head and face mask?