Ok to give context to their seahorse conversation at the end, Kade picked seahorse cause it's the male that carries and gives birth to the babies lol.
In the book, they talked about it before. There were maybe 2 times? when Kade got mad at how unfair and hard life is for a woman and she would tell Date she wishes she was a female seahorse and he never got it lol. And then the end coversation is almost exactly like in the book when she brings it up again with the "next life I'm going to be a seahorse" part.
I love that about the book, the little callbacks to some earlier moment.