Okay. Anna and I finished watching the series last night, so I can finally read this thread again. >8->
I was floored. I was expecting a bizarro "not really an ending" ending, something like The Prisoner or so many anime series (Evangelion and Escaflowne, I'm looking at you). Instead they ended it, leaving no ambiguity as to what was going on, and with just enough denouement for emtional satisfaction. I was beginning to expect it as soon as they said "We couldn't remove the tumor," but that's fine.
And really, it's the only way the probability wave of the series could collapse. I'd been struck the entire time by how over-the-top most of the episodes were, but they made that make sense. The character dynamics and the plots were implausible because they didn't have to be plausible; the whole thing was the cop show in Sam's head. So of course the whole department only ever had one crime to solve at a time. Of course there were about twenty people working there but only four of them ever talked. Of course police officers beat the crap out of each other on a regular basis to express their opinions. I wasn't going through the series expecting him to finally choose the fantasy, but they made that make sense too. The bartender's lines were very clear and strong there.
And yeah. Annie. (I've asked Anna for a WPC Cartwright for Christmas. Damn, she's cute. Not a WDC Cartwright, though, only because I prefer the uniform.) >8->
Spin-off series: I'd heard nothing about that, and have mixed feelings. I guess that throw-away bit at the end about him recording things for the psychologist was the set-up for that? On the one hand it sounds totally absurd, and I don't know why they'd bother. On the other hand, the premise for Life on Mars was absurd enough to begin with, and they made that work... If it does come to pass, someone be sure to post here and let me know if it's worth checking out the premiere.
This was a really good show.