I think Jane could be hallucinating Lorelei's and Lennon's deaths.  At the end of the 2nd episode this season, Jane is drinking belladona so he can hallucinate again.  It is possible he was doing it again when Lisbon showed up to tell him about Lorelei.

I also think Volker could be Red John.  He said he had a stuttering problem when he was young.  Although, he probably wouldn't have gotten caught if he was Red John.