The T-Shirt
The film-makers have blown it by letting Ford play Deckard as himself. It looks as if they offered him a lot of money, and he turned up on the day not even knowing what film he was supposed to be in.
They could at least have made him wear a different T-Shirt from his usual: one with a chest pocket on it, a red one, striped, anything but the standard Harrison Ford T-Shirt.