There is a special encounter in which you encounter a man in power-armor that has rusted to the point of immobility. Talking to him makes him ask for "Oil Can", which you can pick up and use on him.

If you help him, he'll thank you by giving you 150 Micro-fusion Cells, then go on his way.

This is a reference to the Tin Man from The Wizard of Oz.

There is a special encounter in which you encounter a Bridge Keeper who will only let you pass after answering three questions correctly. If you answer any of them incorrectly, you die.

This is a reference to the Bridge Keeper scene from "Monty Python and the Holy Grail."

There is a special encounter that consists of a group of "Unwashed Villagers" fighting a character named "The Grim Reaper". This is a real world reference; one of the first Fallout communities ever was called "The Unwashed Village Community" and this encounter is based off them. The people who you find in this encounter are members from the community, and actually fought a spammer name "Grim Reaper" who plagued the community for a long time, and was seen as an evil rival to the Unwashed Village Community.