About the "Let's sleep in the King's bed!" line: in FFIIIj, when you go to the top of Princess Sara's tower in Sassoon Castle, you can walk up to Sara's bed and, er...put delicately, your righteous noble Light Warriors do some serious shakin' around during the night. So I'd assume that the thing about sleeping in the King's bed was a tip-off to FFIIIj's corresponding scene, but it shouldn't have been there for two reasons:
(1) Since Square never translated FFIIIj anyway, the scene in FFIV has no context and is just nonsensical. If the American audience knew that it was a tip-off, things would've made more sense.
(2) If the Light Warriors in FFIIIj were giving themselves a good time in the bed of a pretty girl, and Cecil is apparently supposed to be doing it in the bed of an old guy...ew, I don't wanna think about the implications there.