Okay, after the very famous scene where the bird gets killed in the shower, Norman wraps her up in the shower curtain. Look carefully, SHE IS WEARING A BRA!

But No, this was not a slip-up by the director of the remake, this was a deliberate slip-up, because Hitchcock did it in the original. So really the slip-up should be on the '60's Version!

Credit to the director for hiding it there again though, should this be an easter egg!?