(Feel free to add more)
Some of the lesser known things about KOTOR2. Did you know about all these?
* There are plenty of lines for Kreia in the Dxun Tomb, Atton on Onderon, and Mira could help you fix the speeder bike on Nar Shaddaa, and has a few lines with Vossk (who is removed after the main plot). None can be triggered due to not being able to have said teammates there (None restored by TSLRCM)
* During the smuggling quest if you need to steal the shield you can ask the controller about the shield. (TSLRCM restored)
* If you follow the Czerka line on Telos after delivering the droid you can start the Corrun Falt sidequest by talking to him. (TSLRCM restored)
* If you follow the Ithorians instead of bribing him you can follow him home, then kill him to learn about B-4D4. (Main TSL)
* When being B-4D4 try talking to everyone on Telos. You can extort Chano, ask the welcoming droid in the docks for bribes and much much more. (Main TSL)
* Most side-quests on Telos can no longer be started or completed once you visited the surface, unless you use TSLRCM 1.7 (or higher).
* If you break the rules while fighting Handmaiden there is a whole convo about telling her there are no rules in war, which can gain alignment points and influence. (Main TSL)
* There is an alternative "Lesson of Strength" from Kreia that's not STR and CON. This alternative REAL lesson gives other boosts, more XP and more INF from Kreia. (Main TSL)
* You can escape the Taku'ta training room in the Sith Academy by using the console and giving the wrong answers, so without fighting... (Main TSL)
* If you take Hanharr to Onderon he gives you an overview of the planet. (Main TSL, although VO-less without TSLRCM)
* You can win the final fight with Visas (training) by breaking the rules and explaining Kreia why you did. (TSLRCM)
* If you lower Atton's influence a lot and raise Disciple's to max you get a few EBO-scenes few people see. (Main TSL) Also, the Atton-Disciple scene on Malachor (TSRLCM).
* There are alternative lines for Atton and Handmaiden with GameCompleted=3 in your swkotor2.ini. Also an easter egg Nihilus main menu that fails to trigger in regular TSL but hopefully will appear in TSLRCM 1.8. (Main TSL)
* If you take HK or T3 to Goto's Yacht you can get permanent +1 to Dex for them. (Main TSL- Although bugged without TSLRCM)
* You can get the second group of bounty hunters to back off on Onderon if you have Goto in your team. Of course they have a Visa, but you can still attack them for DS points. (Main TSL)