When Louise started to experience time in a nonlinear fashion I was immediately was reminded of Slaughterhouse Five and loved how they depicted that idea, of experiencing time as a whole instead of a cross-section. The central misunderstanding around the weapon/gift message was a goddamned brilliant exploration of humanity that in hindsight I should have picked up on during the kangaroo anecdote given that it was a part that I remembered well from my first viewing. People mentioning romance did kind of spoil the ending for me because what else was going to happen? Still, I thought that the parts with Hannah were flashbacks until she went into the shell with Costello I think? Or was it Abbot? The one that didn't die.