As cool as that would be, didn't they pretty much give Wally all of Barry's origins and attributes in the JL cartoon? The job in forensics, the accident, etc.... the same way they combined Hal and Kyle.
We were never really given a detailed look at Wally's origins in the DCAU. Maybe he was a protege of Barry's at the CCPD crime lab, and at some point Barry found it necessary to try to recreate the conditions of his accident, and somehow Wally stumbled in and lightning literally struck twice.
And yes, there's the
Flash episode where Barry sees posters for Superman and Batman movies, but there's also a first-season
Static Shock episode where the main characters talk about Clark Kent being Superman as if he were a fictional character, yet that show was later folded into the DCAU. And there's a
Superman: TAS episode where Lois namedrops Wonder Woman years before
Justice League shows Wonder Woman leaving Themyscira for the first time. So there are inconsistencies, but no greater than those that already exist within DCAU canon.
But if it does turn out that the '90
Flash was set on Earth-2, that would mean that Earth-1, Earth-2, and the DCAU are three separate worlds that all have identical versions of the Trickster in them. Is he somehow the one constant presence that exists across the entire Multiverse? Does that mean we could see Mark Hamill on
Supergirl?
When we saw Zoom's Father wearing the helmet I jumped to the conclusion he was a speedster, but I guess that's wrong? What's with the helmet then?
It's a World War I-style soldier's helmet, a variant of the
Brodie helmet. James Zolomon had just come back from a years-long war, and his helmet and leather jacket were implicitly the military uniform of his time. (After all, if they have Art Deco in the 2010s, it's not so great a stretch that they would've used WWI helmets in the '80s.) Hunter Zolomon evidently modified that helmet and jacket, or ones like them, into his Flash uniform.
Hmmm...if Zolomon is the same age as Teddy Sears, then his childhood origin scene took place around 1988. Was the world of the 1990 Flash so different that they would have had guys in WWI-style helmets fighting the War of the Americas?
Oh, that's a good point. Yeah, I was assuming the differences would mostly have emerged in the 25 years since, but if they go that far back, then it probably couldn't be the same Earth. So maybe my DCAU theory is safe.