During the Credits
There were no extras during the credits of The Last of Us: Part II at launch, besides an extra song from Ashley Johnson (Ellie) and Troy Baker (Joel).
In a post-launch update, players who complete the game on the hardest difficulty can hear Joel singing an extended version of “Future Days” during the credits.
MediaStinger’s founder, Paul Curtin, is also listed somewhere in the credits… see if you can find him!
After the Credits
Besides New Game+ being unlocked, there are no extra scenes after the credits of The Last of Us: Part II.