Here's some bugs and errors I've come across (most are very minor).
I'm playing on Windows Vista, Fallout 2 (v1.1, US, Humongous)
I'm using the newest version of the RP with all fixes. The only other mod I'm using is Magnus's Weapons Redone.
1. On the wiki page for this project there is an unconfirmed bug report about never being able to ask Vic about the water flask.
I can confirm that this is the case for me as well. I've started several new games and no matter what I do, I can never get Vic to say anything about the water flask. Instead, I get the option to ask him "Where's Fred again?" (Despite him never telling me about Fred in the first place). He'll then respond with, "From Ed, he's a brahmin dealer over in Vault City. You been there before? Let me show you on that map thing of yours." I then get the pipboy message, "You learn about Vic being a trader." and I get 200 xp.
So it seems he thinks that I asked him about the water flask. If I then try to ask him about something, I can once again pick the option "Where's Fred again?" and he'll say, "Vault City. Check that fancy map thing of yours."
2. I found a minor typo with Vic. If you kick him out of the party by telling him to wait, and then try to talk to him again, one of the many things he can say is, "Hey, Boss. You want me to join up with you know?"
I'm pretty certain that "know" is meant to be "now".
3. In the Den, the addicts on the west side seem to have an ungodly amount of action points (enough to punch about ten times in a row, or walk across the entire map in one turn), while the east side addicts seem normal.
Here's a couple things I found with the Slaver Camp.
1. After I got the slaver camp location from Metzger, I noticed that it had appeared on my map in a block of nine visible squares. However, instead of the Slaver Camp being centered in the nine squares, it is instead in the top middle one.
2. When talking to the door guard at the Slaver Camp, if you fail to convince him that you're there to get more slaves for Metzger, he'll give you the option of "Leave now or you'll find a bullet in your head." You can then choose between:
"I'm leaving."
or
"I think I'll stay and kill you first."
If you choose, "I'm leaving." you'll exit dialog, but before you have a chance to do anything the slaver will enter combat and shoot you, saying, "I warned you, asshole."
So you have no chance to actually leave. Perhaps it was intended this way, in which case you should just ignore this one.
3. If you manage to talk your way into the Slaver House, and talk to their leader, Don, you can have the following conversation:
PC: Metzger sent me. He needs a few slaves.
Don: Metzger sent you? [He fidgets uncomfortably] He wants more slaves already? He got a shipment last week.
PC: Are you questioning the boss? I don't think he is going to like to hear that. Perhaps I should bring him here so he can ask you personally. You know how much he loves repeating himself.
Don: Metzger sent you? Yeah right. He got a shipment of slaves last week. You're full of shit and you're wasting my time. Death is your only friend now. [Signals to his men] Let's take care of this loser.
And then combat begins.
So you see the first part of his second response is very redundant. I suspect it was meant to be his response if you failed the speech check on the first line. But anyway, Metzger's second response would work much better if you removed the first two sentences.
And a couple things with Sulik's Tribe.
1. I noticed that Manli and the Head Warrior both have 600 hp. I'm not sure why, as it doesn't actually make them that hard to kill if someone wanted to be evil (they have crappy weapons and no armor), it just makes it take a very unrealistically long time for them to die.
2. A minor typo. When I examine a random member of Sulik's tribe, I get the description: "On of the few remaining people in the tribe."
3. Just for fun, after freeing Sulik's sister and Sulik left my party to say "Byes" to his tribe, I then went to the Den and became a slaver. I returned to Sulik's tribe, and they went hostile, as I expected.
However, their combat taunts all said "Error". Also, Sulik (who was not in my party) joined the fight on my side, happily slaying his sister and his tribe. After we killed them all, I then talked to Sulik and had him join my party. He then instantly rebelled and attacked me for being a slaver. Pretty funny stuff.
4. And finally, I found that after I slayed everyone in the tribe, I still couldn't enter the cave that was being guarded. Just seemed a bit odd.
EDIT:
I found another odd thing with Vic. You can't rest around him if he's not in your party (i.e. you told him to wait). I can tell Sulik, Lenny, and Cassidy to wait and I can rest around them just fine, but not Vic.
At first I wasn't sure why I couldn't rest, but when I entered combat mode, I saw that all my NPC's (none of which were in my party at the time) were green except for Vic, who was red. As soon as I had Vic rejoin my party, I was able to rest like normal.
Strange.