

Ken goes to a restroom marked as unisex
I'm a new fan who started reading the manga. I'm still on Volume 1. I haven't watched the anime—though of course I am aware of ""Unravel"—but I am vaguely familiar with the main story beats until Jason.
Anyway, in Chapter 2, when Ken recovers in the hospital after the organ transplant, he walks into a unisex restroom. A restroom for both men and women.
I think it's a neat little thing that serves as a preview for the theme of body horror found in the story. Body horror that is sometimes manifested in Kaneki as body and gender dysphoria caused by his declining mental health and the fact that his whole life has changed because he received Rize's organs and is now metaphorically haunted by her, seemingly possessed at times.
I know I'm a bit late to the party and that the manga has most likely already been picked clean of these cool little moments, but in case you didn't know, now you do.