I remember reading an interview with Edward Bunker who played Mr Blue. He was a real life
convicted criminal. When asked about the movie he said he didn't think Quentin had ever met a criminal in his life. The scene in the diner he said wouldn't of happened. Heist crews would never be seen in public together before a robbery. You'd stand out a mile. And you wouldn't argue over a tip. The staff would remember you. Especially in America were it's customary