The CW website puts all the shows online the next day to watch for free (with ads).

One of the Flash or Arrow producers called Supergirl's verse Earth-CBS, which I found amusing.

We saw a couple flashbacks with Earth-1 Wells before he got killed where he was with his wife. He seemed like a really good guy.

Even without the spoiler thing, I don't think they'd go there. M'gann in the comics is a teenager, most often associated with the Teen Titans. Obviously, she's aged up here, but that would be really weird.

Something similar with Batwoman. Kate Kane's backstory has her kicked out of the military academy, because of Don't Ask, Don't Tell. We haven't reached the point where it doesn't make sense quite yet, but eventually she's going to need a new backstory.

Well, in the season 2 premiere of Flash, Cisco explicitly stated that they upgraded the security system. About 2 seconds before "Jay" walked in.

More reasons they shouldn't have cut the "How do you shave?" joke that was in the trailers for last week's episode.

Probably because their sets look too much like Canada to convincingly be Africa. Remember last season's "Wild West"? ;)

Cisco has powers over vibrations. (Like Quake on Agents of Shield). He can vibrate the molecules in the air to make a directional energy blast. Since in the DCU different universes vibrate at different frequencies, he can also see into other universes. Last season, he was just discovering his power, and didn't know…

Cat's role is definitely reduced. Calista Flockhart was reduced to a recurring character from a series regular, because the budget cuts meant they couldn't afford her.

Same.

There was a flashback to her about to pull a gun on a German military officer, but her father stopped her before anyone saw what happened.

Same, but supposedly DC is considering/working on a Booster Gold movie that's probably preventing the TV-verse from using him.

In the comics, Yo-Yo is her given name (Yo-Yo Rodriguez). Her code name is Slingshot, so they could change it if they want to.

Hawkgirl was hugely popular in the Justice League Unlimited cartoon. She has little in common with the LoT Hawkgirl though. JLU used the alien cop backstory for her instead of the reincarnated Egyptian princess one.

Radioactive shield

Dollhouse SPOILER
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Bennet

Cadmus was mentioned back when the DEO first discovered Hank was really J'onn. Cadmus was where they were taking him to be experimented on before Supergirl saved him.

TV Flash is allowed to exist separately from movie Flash because he's been grandfathered in. The show's already on and super popular, so there's not much they can do to change that.

I was really hoping Snart was going to get a cool cybernetic hand.