In the scene where Eastwood is watching "the city of Lago volunteers" training,he is drinking a beer. The first time he lifts the glass to drink, it is about half empty. After he says something to the man with the knife, he lifts the glass for another drink and it is nearly full.
At the end of the film when the Stranger (Clint Eastwood) is riding out of Lago, he passes a midget who is painting a name on a tombstone. In the next shot you see two more tombstones to the left. The names on these are "Sergio Leone" and "Don Siegel."