Yeah, when Tony wakes up from his therapy dream where he "confesses" to all those deaths, I too at first thought the whole thing had been a dream, that he only imagined killing Christopher. It was entirely possible given the history of dream episodes on this show. But by the end of those episodes we knew it was a dream, they never left you hanging. If it was a dream, we would have seen Christopher at the end of the episode. But when I saw Tony still had the scrapes and bruises from the accident when he woke up I knew the only dream was the confession in therapy. (Done to climb into Tony's head and explain why he did what he did to Chrissie) I guess I was hoping (and still am) that it was all a dream.
Thanks for your fine work, Michael Imperioli.