After the first hunt, when the vampire skulls are lined up on the hood of the Jeep, Catlin is counting them, exclaiming, "Nine! Goons, man! Not a bad day's work." Then Montoya comes up behind him, pats him on the shoulder, and says, "You're the man, Boone."
When Katrina is telling Jack and Montoya where the Master is,
she screams "Oh, my God, he killed the priest!" Montoya asks how they were going to find which church in San Miguel, Jack says "The one that's missing an old guy". Katrina never said if the priest was young or old.
Regarding when Anthony Montoya (Daniel Baldwin's character) fires a short burst through the sub machine-gun and then uses the barrel to cauterize his neck wounds; there's no way such a short burst would produce the kind of heat needed to cauterize a wound like that.
As Montoya rescues Crow from the cross he shoots into the front of the cross with an arrow, this implies that this side of the cross would crash to earth first (with Crow facing earthwards), but the backside of the cross lands in the next shot on earth.