Hall was beheaded at one point.Given the scar that encircles his neck, this seems fairly obvious, and it's a common theory among Supernormal fans. Still, it's not confirmed. If this is the case, though, it speaks volumes about the extent of Hall and Eva's Immortality.
Akela is a lesbian/bi.Not extremely obvious, but seems to be hinted at in the way she reacts to people, and body language, especially in panel one of this page.
Fiona's father knew that fiona would travel to the other verseAnd so, he trained her like Sarah Connor did with her son...
Elvina and Britta are clones of Inga Jorgenson.Given that Hall and Eva are evidently clones and that Inga was the project leader with a Strong Family Resemblance to our favorite bumbling twins, it seems likely that she was cloned as well.