Mood Dissonance: It's a chest-beating rock anthem about why it's a good idea to have a nap. Justified insofar as Nathaniel thinks it's unmanly to nap, so a conventional lullaby wouldn't work on him.
"(Tell Me I'm Okay) Patrick" (sung by Rachel Bloom)
Sanity Slippage Song: Downplayed, but Rebecca is definitely starting to crack a little:
Rebecca: Seriously, Patrick, was I sick the day in school they taught you how to be a normal person? It just feels like there's something fundamental I'm missing out on. Like, is there an instruction manual? You get what I'm saying, Patrick? It just it just feels like everyone is in this cabal of normal people, and they're all laughing at me like I'm the jester in my own Truman Show. Patrick, tell me what the secret is. Just tell me what the secret is. Is there a manual? Do you have the manual? [Death Glare, snarls] I know you have the manual, Patrick! I KNOW IT'S IN YOUR TRUCK, PATRICK!
Sitting Sexy on a Piano: Everyone takes a turn, first Rebecca, then Patrick the delivery guy (to his bemusement) while Rebecca plays the piano, and finally both of them while the package plays the piano.
Tropes in this episode:
Nice Guy: Patrick the delivery guy is definitely this, listening patiently to Rebecca's various dilemmas (even if she breaks down or yells at him), offering advice, and even keeping Paula apprised of Rebecca's problems.