ok so I THINK I've found the "extras" in this CS but need to check as I see people in this thread talking about 2nd stage dance party which I don't think I've managed to do, but maybe they are just calling it something different. Don't read on if you don't want spoilers etc.

You are missing 2nd ...

You can also make characters a litteral dickheads.

Updated to version 1.13.2

Added some small fixes to dance party event (unfortunately, it can still bug out).
Changed the bit clothing options for player. Now, you can go directly from naked to dressed up pants.

This update is save compatible with 1.13.1.

All non-periodic trigers have perform never. That is normal thing.

These events get called from the other scripts.

Updated to version 1.13.1

Fixed issue where Ashley would not dress up after getting reward from her, for giving her clothes back (Original Story bug).
Starting dance party will not automatically trigger Amy getting stubbed toe (but ending it, could do it instead).
Added mechanics where, if during ...

One thing I would change is disabling sex interaction with other characters, if already "interacting" with one of them, since it leads to posing bugs.

Additionally, I think it was missed opportunity that 2nd pair of characters was not performing sex at the same time, at the end.

Talk with people, after getting blocked by Derek. You will eventually find clue that will make you find the recorder.

Updated story to version 1.13.0

Main highlights:
This is first release compatible with 0.12.3 game version, and includes integration of all 0.12.3 Original Story content.
Due to semi-official support of Simon Says opportunity in Original Story in 0.12.3, this opportunity is tweaked a bit. If you ...

Regarding chatter, I think also that chatter based on shooing others to get out of area should be different.

It's weird to see girl having hand expressions showing that is shooing others to get out of room and then display just regular chit-chat.

Similarly to this, Amy, in Chasing Amy ending will not give any dialogue after BJ orgasm, while it works correctly for sex ending or cunnilingus.