In the beginning when Antonio and his Mariachi just finished playing, you hear some clapping.
As the man in the white suit (Bucho) walks in, he then strikes a match on some guy's face. You can clearly see the striking paper they stuck on that man's face.
Not that it really matters but, the clapping guy isn't Bucho. The clapping guy is Moco from the original. You see, "Desperado" is a sequel to the film
"El Mariachi". Moco is the guy who shot Antonio Banderas's character in the hand. You see this happens in the first one. The scene is identical to the flashback scene in "Desperado" (the guy with the moustache and sun glasses is even in the first one) apart from it wasn't Antonio in the first one, it was Carlos Gallardo who played the same character Antonio played in "Desperado" You may recognise Carlos from "Desperado"...He played Antonio's friend, Campa (the guy with the machine gun guitar cases.)
Well, he's not playing Mocho. Director, Robert Rodriguez usually casts the same people in his films sequels, but as different characters. Like Carlos Gallardo (playing the original Mariachi in the first movie) plays Baneras' friend Compa. It's his little trademark.