The Apache are shown beating the drums with their hands, whereas they and all Native Americans used sticks or drum beaters.
The vicar, (Arthur Shields) suggests the towns people, held in a building by chanting Indians, sing 'Men of Harlech' which they do in Welsh. Very strange being that the majority are cowboys. Or, not so strange after all, given that the film's prologue makes it clear that a lot of the townspeople are Welsh miners.