No Question: Powers Boothe plays the hankie salesman in the store who's telling Al Pacino about the different Hankie Codes.
But who else reconized Powers Boothe in another scene?
Al Pacino is waiting in a bar. Many leathered (approx 5 - 7) guys walking on the front of him and watching to him. One of those guys was also Powers Boothe.
Right?
I think you're right.
There are a lot of scenes like that, in which characters cross paths with one another over and over again, without recognising or acknowledging one another - like the reappearance of Simone in the club and, later, at the park; and isn't the guy that Pacino follows out of the park (after seeing Simone) the first killer?
'What does it matter what you say about people?'
Touch of Evil (Orson Welles, 1958).