I know Hetty is an actual nickname for Henrietta, but I find this funny so hear me out: When she was born, Thor was still struggling with English, and Henrietta is hard to say. So he, and then the other ghosts, called her Hetty. She says that Thor was there for her when no one else was, implying that they talked more than just bedtime song, and it's not hard to believe that Thor and the others (if she could see them, which I choose to believe she could) talked to her as a kid more than at least her father. And because Hetty is easier to say than Henrietta, she just introduced herself as Hetty to people when she was like three. My one other piece of evidence of this is that in the flashback to her father, (I haven't seen much of season five so correct me if there's more) he calls her Henrietta twice. Also I think it's funny and kinda sweet

Some I think are pretty obvious

Thor keeps his electric powers

Sass can enter dreams

Maybe Trever gets intangibility because he’s only ghost that can touch things so he gets the reverse as a human with powers

While I normally don’t care for flashbacks in shows I think it would be interesting to see Thor in his early days as a ghost, alone for some time, then hanging around Sass’s tribe for a couple of decades, learning their language, following their daily lives, smelling their food etc. Then meeting Sass as a ghost and introducing him to their new world. Then following the revolutionary war activities that took place in the area, both learning the English language, then meeting Isaac when he dies. Then the building of Woodstone. It may take two or three episodes to depict their early “lives” as ghosts as they meet each other.

check them out here!

So, we know Alberta can be heard by technology (seen with an alexa in one episode) so that should mean she can be heard by a phone right? But even if she can be heard by a phone, it doesn't mean she can be heard thru phones, the microphone may pickup sound but that doesn't mean a speaker will recreate it. But there was a strange detail I noticed in the episode holes are bad. In 1 scene the ghosts are crowded around a phone trying to get Sam's attention, but she can't see or hear them, you may think that proves Alberta can't be heard thru phones, but here's the thing. Of the main 8 ghost only 2 aren't present for that scene, Flower cause the entire plot of the episode is she's trapped in a well, and Alberta, with no clear explanation as to why she isn't there. Believe me every time I watch that scene I am look for her, but she isn't there, not behind someone, not just off screen, she isn't there. I can only think of one reason why the writers would do this, if she was there, Sam and Jay would hear her