Have to investigate Trisha a bit more, though not sure yet how to fit that in with wooing Chris.
One odd thing I noticed: if I don't play the VR game with Sarah in chapter 2, the rescue mission is automatically done with Sarah. No option to choose between her and Chris. It seems like the VR game is meant to trigger allowing Sarah to volunteer (so you get to pick), and not playing the VR game simply skips over that choice. However, the default choice for that decision seems to be Sarah, making the VR game a requirement for being able to decide otherwise. (I really would've expected Chris to be the default choice, given how the whole conversation goes, it just suddenly switches to Sarah once you finished talking with Kelly)