You probably completed the main quest of Cyberpunk 2077 before venturing into Dogtown and Phantom Liberty. Still, if you finished the expansion first, some unique dialogues await you in the main game.
Please note, there could be spoilers ahead, so avoid them if you haven't completed the expansion or the main game. However, knowing these points won't necessarily spoil your gaming experience.
There are several instances of altered dialogue, with a majority of them revolving around the AI tech V located in Phantom Liberty. Specific lines of dialogue related to the tech are offered by both Anders Hellman and Alt Cunningham.
Furthermore, if you decide to attend pop star Lizzy Wizzy's concert post-expansion, a brief comment from her can be heard.