(Probable spoilers if you've not seen up to 1x07 'Echoes' or you're majorly spoiler-phobic)
- Adelle's bosses (higher up, even, than the Rossum Corporation) turn out to be Wolfram and Hart.
- That, or Bad Horse and the ELoE.
- Felicia Day's appearance is as Foxtrot, whose role as an active ("Penny") is just to tip Billy over the edge, much like the First did with Angel in Amends
- One of Echo's future assignments is either: a cheerleader winning a cheer competition; a morgue attendant with an extreme case of deja vu; a detective who eventually convicts Nate Ford from Leverage.
- Alpha to wear Hawaiian shirts. And have toy dinosaurs.
- Victor and Sierra to get together without one of them dying.
- Mellie/November to be seen enjoying strawberries.
- Michael Muhney to play Ballard's brother.
- Tony Head to appear as Adelle's husband.
- Alpha and Echo turn out to be brother and sister.
As an aside, given that Rick Castle's daughter is a redhead, who else wants her mum to be played by Christina Hendricks?