In the opening scene, Hey Boy is eagerly checking a newspaper to see if he has won a lottery. Paladin steps up to see what is going on, and Hey Boy, flustered, addresses him familiarly as "Paladin"--without the "Mister". Paladin ignores it, and it may indicate a deepening relationship, but Hey Boy is probably lucky no other member of the hotel staff overheard him.
Paladin: Siebert, letting your men get killed one at time may fatten your end of the ticket. It won't save your skin!
The song the men start singing at the end is called "The Minstrel Boy" by Thomas Moore (1779-1852).
"The Minstrel Boy to the war is gone
In the ranks of death you'll find him.
His father's sword he has girded on
And his wild harp slung behind him."