Corrected entry: Duke gives the girl he met at the bar a 5 dollar bill with a corner torn off. She gets killed while in the phone booth. The next morning Norman is cleaning the phone booth. Duke goes in the office and the 5 dollar bill is back in the cash register. Since he knows about Norman's past, he should find it odd! Or at least be wondering how it got back in the register.
Corrected entry: The sheriff opens the ice machine and grabs a handful of bloody ice. Everyone is sitting around talking. You can plainly see the blood from the ice on his hand and mouth yet no one says a word about it.
Correction: We, the viewer, can see the blood, because we know it's there. None of the other characters do, so they don't see it.
You can plainly see the bloody ice and everyone is looking at the sheriff as he's talking! Your correction says only the viewer of the movie can see the blood. Yeah that makes sense. It was even on his fingers.
Correction: He does. He raises this exact point with the journalist shortly after.