I think we should be told...

I just watched an episode of "Life on Mars" (I missed approximately 50% the first time around) and noticed that the producer was one "Claire Parker".

Somebody, and it's not clear to me who, owes me an explanation (and a set visit for the next series).

Edit: And by an explanation I mean has Sam Tyler actually travelled back in time while in his coma, or is he hallucinating the whole thing?