Noticed a minor addition to the anime. During the three parts, Touko, Sayaka and Yuu each asked "Which colour do you like? The hydrangeas." Which isn't in the manga (though the manga did have hydrangeas in the rain scene). I looked up what they mean and it's such a great metaphor for all three situations its used in:
Heartfelt and honest emotions of any kind
Gratitude and thanksgiving to someone else
Developing a deeper understanding of two people
Heartlessness and acting without thinking about the feelings of another
Frigidity and disinterest in a romantic proposal.
This is such a great little detail and I think the only example of the anime adding something more profound to the manga (with the exception of all the things anime can do that manga can't).
I did like the way they reordered it as well, I think it flows better this way.