"Bend when you can, snap when you have to" Legally blonde reference in Dear Reader

The same bird chirping  in exile and evermore in the first verse (both feat. Bon Iver) 

Clean reference in Call it what you want: "When the flowers that we'd grown together died of thirst [...] And the sky turned black like a perfect storm" (Clean) "All my flowers grew back as thorns, Windows boarded up after the storm" (CIWYW)

New Romantics reference in Call it what you want (sorry I'm obsessed with these songs): "I could build a castle out of all the bricks they threw at me" (New Romantics) "My castle crumbled overnight"

Her grandma Marjorie's singing in Marjorie 

The sound of a train in the intro of Sad Beautiful Tragic

The throat clearing in ... Ready for it? 

Cat meowing in Dear Reader

The way she sings "And he can be my jailor" in ... Ready for it?

The voice in the beginning from Gorgeous is James Reynolds (Daughter of Blake Lively and Ryan Reynolds)

The cheering in Question...? after "But 15 seconds later they were clapping too?"

The BWUUUUU in the second pre-chorus after "now" and "down" in Message in a bottle

That's everything I remember rn (pls what did I miss? 😭)