The only reference I'm aware of is from
The Unbroken: Amrit has their poster in her room.
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Likewise in the new
Hellcat Lounge chapter the MC and Zach watch Valentine's MMA match from the most recent
Unbroken update.
Might as well give my thoughts the chapter while I'm here. The story and presentation is intriguing; it feels like the game is committing to a slow and steady development for the main characters, though it's becoming clear we'll have plenty of chances to intervene in the girls' lives for the better. That's always nice to see.
Unfortunately the game is very much NOT my style; I despise that damn contest, the veneration of the MC is beyond excessive, and when you get down to it I don't like most of the LIs. Mary is by far my favorite, but we haven't seen much of her and she feels a little young for the MC. Caitlin is okay, but not very interesting (beyond her plethora of family drama). Even the side girls come on a little too strong, making them feel more like Achievements than characters. I don't hate the other girls, but I have no interest in hanging out with them more than necessary - especially Sloane.
What I do hate are the dynamic images. They're a mixed blessing at the best of times (acting like choppy animations that disrupt my preferred pacing), and the game uses them
*way* too often to stand out when the motion might highlight something meaningful. This is a Ren'Py visual novel; still images should not be the enemy!