I know Sam was deep undercover so everybody except Lambert and Williams thought he was a terrorist, but if you listen at the end of the 360 version (good ending) you hear Williams telling the SWAT guys and FBI not to let fisher get away and then they start shooting at sam. Wouldn't Williams tell them he's undercover and not to shoot him?

that's the part thats getting me confused

I also noticed that (again good ending) the news cast says that "a plot to detonate nuclear devices in NYC and LA was stopped" but what about the Mexico City bomb, are we just to assume that it exploded?

Are yo talking about next-gen or current-gen?
if you are talking about next-gen at the final of the 8th mission you choose to detonate or not the mexico bomb.And in the current-gen at the end of mexico mission you decide to dtonate it or not. [IMG:left]sc 4[/IMG]

Yeah, but from rumors about ConViction from UBI, Sam finds out that there's corruption in 3rd Echelon - which probably means Williams.

Also, in Essentials we find out that Grims discovered evidence of Williams corruption but got caught and got the disc with the evidence taken from her... by Williams!