I've found two things of minor sugnificance.
1. In the raider's stronghold in Fallout 2, when you successfully disarm the traps and crack the safe you're given the dialouge option, "Stop that grinnin and drop your linen", a lyric from the song Shake A Leg by AC/DC, from their Back In Black album. Being the AC/DC freak I am, I caught it right away.
2. In the Bishop's Casino, upstairs where you can meet and seduce Angela Bishop there is a pool table, you can take the 8-Ball off of this table and continuously shake it for suggestions, it will tell you where the designers have hidden tons of stuff in whatever town you're in, such as letting me know that there's some grenedes in the toilet at Mordino's Casino or to talk to Father Tully after I beat the game to get the hintbook.