It may also be on an Earth where Supergirl is real, but
not Earth-38.
Or it may even be on Earth-1, where Supergirl is an occasional visitor who's semi-real.
Those possibilities did occur to me, but they seem less likely. Particularly the latter, since there are other female heroines who would be more familiar/famous to the people of Earth-1 than Supergirl, who's only really shown up in public twice. If an Earth-1 Grace were going to name a real superhero that Anissa might cosplay as, it'd more likely be someone like Vixen, Black Canary, or Hawkgirl.
And "real Supergirl on not Earth-38" is a possibility, yes (according to Harry Wells, certainly), but why bother? If the producers wanted to set their show on a world with a real Supergirl, there's one already available.
Basically, it's as non-committal reference as it can be and I hope they keep all of them that way this season, because I can't see any possible storyteling reason to limit their options later on.
Sure, but I'm thinking that it opens a door if they want to go through it later. I'd like a second show set on Earth-38 to balance out having so many shows on Earth-1. Also because Black Lightning as a comics character has established ties to both Superman (through their common Metropolis setting and shared use of Inspector Henderson) and Batman (through the Outsiders), and we know Earth-38 has both (though we also know that Earth-1 has a Bruce Wayne, at least). So it feels like it would fit there.
(Judging by Anissa's costume, Catwoman may also be real and/or a comic book character here

)
I dunno, catgirl costumes are pretty generic stuff. That actually disappointed me about the party scene -- it was supposed to be a cosplay party, but nobody was dressed up as any recognizable character. Usually, when comics or animated shows in superhero universes do costume-party sequences, the partiers are always, always dressed up as superheroes. Thanks to the way they set it up through Grace, they could've done that and still kept it ambiguous whether the heroes were real or fictional. And maybe they could've seeded some existing superhero characters that might actually be used in the future.
and Annisa slowly figuring out her powers was kinda cool.
Yep. I loved the sheer joy she expressed when she finally started to get a handle on her powers. So much emotion there.
Speaking of Anissa, the girl's got game, picking up Grace without even getting of the floor of the library.... smooth

. I'm glad they didn't drag out the breakup with Chenoe, since it was obvious last week that it wasn't gonna last.
It was only obvious to me because I already knew she'd be getting a girlfriend named Grace Choi, and that woman didn't seem to be her. Anyway, Chantal Thuy (Grace) is lovely. I look forward to seeing more of her.
So 9 years ago Black Lightning and Tobias Whale had a confrontation that led each of them to believe that the other was dead.
I don't think it's been established that Jefferson thinks Whale is dead. There was still a wanted poster for Whale in the police station in the pilot, so he's still considered alive and at large, although there was one for Black Lightning as well. I think Jeff just doesn't know Whale's whereabouts, doesn't know that he's still active and behind the 100. I guess it's ambiguous, though.
Now Tobias knows Black Lightning's back, but Gambi is hiding the fact that the Whale has returned so that BL won't go after him until he's ready. There's nothing more sinister in that footage deleting moment, right?
That's what we're supposed to wonder. Maybe Gambi doesn't want BL to get obsessed with hunting his white whale (so to speak) and lose sight of the bigger fight.
Also, how or why did Tobias' henchwoman manage to miss BL with the sniper?
Maybe she wasn't aiming at BL, despite what Whale's order seemed to suggest. It could be that her intended target was the priest. After all, he was the one who led the rally in defiance of the 100, and he wasn't wearing body armor like BL, so he was the more logical target under the circumstances. In which case, the question is, why did she miss a lethal shot?
By the way, I looked up the credits, and the henchwoman "with death in her eyes" is named
Syonide, after several DC assassin characters. The first Syonide was a male assassin who tangled with Black Lightning on Whale's behalf, and the other two were women who fought the Outsiders, one working for Whale and the other for Lady Eve. I guess the show's Syonide (played by South African actress/model Charlbi Dean Kriek) is an amalgam of the first two, at least.