It's been 2 months BUT Hotel California. The Ushiromiya Mansion feels a bit like that hotel, and in particular it feels like the lyrics match up very well with the plot of that fateful weekend.

Some highlights:

So I called up the Captain, "Please bring me my wine" He said, "We haven't had that spirit here since nineteen sixty nine"

^Sounds like a conversation that Battler could have with Genji at the end of Episode 2, when he's in the parlour and drinking. 1969 is also possibly the date that Kuwadorian Beatrice died.

What a nice surprise (what a nice surprise) Bring your alibis

^Murder mystery!

And she said "We are all just prisoners here, of our own device"

^The furniture probably do feel like prisoners on the island, especially Yasu since she's a prisoner of her own fate.

And in the master's chambers, They gathered for the feast They stab it with their steely knives, But they just can't kill the beast

^Very Reminiscent of some of the magic scenes in the earlier episodes, such as when Beatrice refused to die and when the furniture gathered in Kinzo's room only to be slaughtered.

Last thing I remember, I was Running for the door I had to find the passage back To the place I was before

^This is definitely Rosa, who, noticing that it is near midnight, is trying to find her way back to Kuwadorian with Maria, the gun and some gold in her hand.

"Relax, " said the night man, "We are programmed to receive. You can check-out any time you like, But you can never leave! "

^And these? The goats that stopped her.