Cassidy Is Named After a Comic Book Vampire
The gunslinger companion Cassidy flat out tells you in dialogue that he was named after a character from a 90s comic. That comic is real: Garth Ennis and Steve Dillon's Preacher, which features a chain-smoking Irish vampire named Cassidy. Fallout 3 later returned the favour with a ghoul named Tulip, another Preacher reference.
