CS1: Celine has name tag in some instances before her name is revealed.

[Akonyl]

Minor, but just remembered about this so I figure I'll mention them while I'm here:

In CS1, there's a quest at the end during the festival where you can give (I think Becky?) 10x coarse salt at her stall for some extra AP, but in her dialog she calls it "course salt".

One that's more vague (but I don't really have any saves for this to tell exactly when it happens), in CS1 there were multiple times (I think 3ish total?) when talking to the "black cat" where the text box was headered with "Celine" instead, long before actually learning the name from Emma(or Celine). I'm pretty sure it happened during convos where you were able to feed her milk, I can't recall if I ever bothered talking to the cat besides to feed her. IIRC, one of the situations was when the cat was on the school roof.

[AdmiralCurtiss]

The first one (course salt) has been fixed at some point, that's already correct.

The second one is definitely a script issue, I'm pretty sure I've seen this as far back as the Vita version, but with the way these script files are structured it's kinda hard to find these without playing through the entire game and checking every possible instance. But yeah, I'll keep a note of this whenever I replay CS1.

[pc-88]

I'm playing through CS1 for the first time. In Chapter 2 on 5/29 before leaving Trista for the field study, the cat is on the bench and has "Celine" as its name tag. Will edit this if I spot any more.
Edit: also Ch3: afternoon of the 6/20 free day, and morning of 6/26 before leaving for the field study.
Edit2:

spoiler?

Emma tells Rean Celine's name in an optional event on the first day of Ch4, so I guess that's it. If I end up replaying I'll see how things play out if you miss that scene.