"Good artists copy. *Great* artists *steal*." Picasso. Colonial Day. Roslin: "Don't worry, I shan't kiss you." Zarak: "Pity, I shave especially close on anticipation of getting smacked by you" is lifted straight from "Patton," where Patton beats Montgomery to Messina.
What else? Comedy in otherwise dark moments. The Tighs and everyone else fighting in Baltar's lab and Baltar points how dangerous it is--there's literally a nuclear bomb there.
There were other things but that will have to do for no--OOH! The early episodes nicely capture how it is the end of mankind. Billy's outfits are always whatever he had on and/or could scrounge. Col. Tigh is about out of whisky. In later episodes everyone has fancy tailored suits and chain-smokes cigarettes while swilling whisky--although the finale has Starbuck offering up the last tube of toothpaste. In the end, one must take license to make the story work. As long as the story actually works.
I still want Arthur Dent, with his bathrobe and a rabbit bone in his beard, to accost Lee Adama for flying the ships into the sun, though.