There is a special encounter in which you can find a place called the "Café of Broken Dreams."

The café is actually a copy of "Maltese Falcon" in the Hub from Fallout 1, and the name is likely a reference to "Boulevard of Broken Dreams", a short story written by Harlan Ellison where the main character sees dead people from the past.

Inside the cafe are five Vault character models, three of which talk about what past players did with them in Fallout 1, and two that are unplayable.

Set, Tandi and Dogmeat from Fallout 1 are in here as well. Dogmeat can be recruited if you show him your default Vault suit.

If you hurt Dogmeat, a character named "Mel" with an Australian accent in a leather jacket will appear and attack you. This is a direct reference to actress Mel Gibson who played Mad Max in Mad Max 2: The Road Warrior.