I didn't understand why Tony didn't just go ahead and 'fess up with Christopher about his whacking Ralphie, rather than awkwardly lyin' his way through it. Christopher may be strung out, but he's no fool when it comes to issues like that. I'd have been insulted had someone lied to me like that and tried to play me for an idiot. Even lying, he could've at least made a plausible lie, like "Ralphie tried to kill me so I had to kill him first." I don't guess it's critical to the main plot, but I thought it was kind of lame.

(BTW: The more I think about it, the more convinced I am that Paulie is the one who burned down the stables!)