On GBU, there are three men who arrive in the saloon for Tuco. When Tuco is in the grotta, three men (the banditos that Blondie kills in the hotel) arrive.But the most explicite thing about the number three is (it's a restored scene) just after Sentenza and Blondie goe away the prisonneers camp; Blondie is sleeping, and there is a noise, so Blondie wakes up (in fact in was not really sleeping...) and kills a man who was a Sentenza bandit. And, I arrive to what I'm telling for, Blondie says he has yet six bullets...And at this moment, Sentenza asks Blondie if the perfect number is not three. After this, Blondie says "Yes!".It's a little complicate when you don't have seen this scene (WHO DON'T HAVE SEEN THIS SCENE??? ), but at this time you understand Leone LOVED the number three...