I think it's neat how Nicholas could just appear someplace. Angelique/Cassandra didn't seem to have that same ability.
She has had the ability since dying in 1795 (we saw her ghost materialize before taking the stand in Vicki's trial), and more recently when Cassandra appeared as Angelique over a sleeping Vicki in the Evans cottage.
Those spirits that Nicholas conjured up sure were scary .
Did you recognize the late David Groh of
Rhoda fame as the ghost who donated an arm to Adam?
EmeraldRose, I agree that it's neat how Nicholas could just appear, and just now I wondered: do we ever see him in the act of appearing or disappearing? I don't remember it ever happening, and that makes it neater, because it's more mysterious.
[spoiler]I might be misremembering, but I think it happens as soon as Thursday's ep, though the effect is more like stepping out of the dark shadows.[/spoiler]
As for disappearing, there's [spoiler]his infamous departure in a ball of flames, heh.[/spoiler]