Fun little glitch: After (or maybe during? Yeah, it's definitely during. I think) one of the missions with Irish (I'm thinking it's the one where you find shaky), there's a part where you hop onto a wagon and ride with Irish. For me, the wagon shot straight up. Just...woosh! Up, up, and away. Horses too. Failed the mission and restarted at that same part b/c apparently the wagon was destroyed. Or maybe Irish died. Hm. One of those.