The show airs on HBO, Sunday night at 9pm.....
BCnU!
I just tossed that one off quickly, but I'm liking the scenario. Amelia would be a few years older than Casey and must have seen something; probably saw her father hide evidence after he got back home.
The Chase case happened before Novak came to work for the District Attorney's office. If any of her co-workers noticed her resemblance to Amelia Chase, they were polite enough not to mention it.
"Gojiratoho" worked as an extra for those scenes and reported back about what he saw. And he spotted a lot more comic book characters there than made the final cut. (I only spotted seven!)
The main character from "V for Vendetta" was seen on the second floor of the convention, and he exists in the movie universe as well. Should he ever be seen on television, he'll have to be shuttled off to an alternate TV dimension because of the type of police-state dictatorship he was living in. Of course, considering how the movie (and probably the comic book) ended, he may have a similar situation as Richard Widmark's 'Madigan', as well as the characters in 'Lost' and 'Ashes To Ashes' (and the British 'Life On Mars' for that matter).
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Angry Bob was in attendance -
You can just see the back of his head there to the left.....
But Harleen Quintzel - her alias in that world - may have existed in Earth Prime-Time as well. And although 'Bored To Death' isn't the format to expect something like this to happen, maybe that was the real Harley Quinn at the comic book convention. At the very least I would think she'd be active in the main Toobworld, just not seen by us. And if that's the case, I don't think she'd be too happy that the televersion of a comic book company had been publishing stories about her, or that this chick decided mock her by wearing the same outfit.
Barry Allen gained his super speed powers in 1990, and for the next year he was quite active in Toobworld battling crime as the Flash. But at some point he may have either lost his powers or died, as he hasn't been seen for nearly 20 years. It could be that having lost his powers, Barry Allen decided to cash in on his fleeting fame (heh heh. "fleeting"... "Flash"....) by selling the rights to his story. And with that came the ancillary deals so that he made money from the tie-in merchandise, like the T-shirts worn by Sheldon Cooper. 
Wonder Woman may still be active in Toobworld, at least as she appeared to be immortal in that span between WWII and the 1970's. So when sisters Faith and Hope remarked that their father's fiancee was a lot like Wonder Woman (when she took measures to get them off a plane that was already sealed shut), it could be that they were basing that comparison on Wonder Woman still being around in the new millennium.
Just one last note about all those other costumes seen at the convention. In Toobworld, characters from the comic book/comic strip universe can cross over to the TV Universe. We've seen this happen in the TV series 'Once A Hero', and in the A-Ha music video for "Take Me On".
In a blipvert for the Canon Powershot, a couple flew back to Barcelona to try again at recreating the moment when her parents first met.......
The latest Greta was played by Summer Glau and her spy caught the unhealthy interests of Jeff & Lester, who couldn't understand how she could disappear into thin air. As their obsession with her could have compromised covert missions operating out of the Buy More, "Greta" threatened to call upon her assassin skills to eliminate Jeffster entirely. Casey put an end to her services there, by giving her the cover story of being a thief who was stealing stock from the company.
'The Sarah Connor Chronicles' is dead; the show is canceled and it's unlikely to ever come back, even in reunion movie/mini-series form. (It may live on in tie-in novels and comic books, perhaps.) So after John Connor was blasted into the Future (a pozz'ble alternate timeline for Toobworld), that was the last we saw of Cameron in Toobworld's "present". (Had the show come back for another season, we may have been treated to two variations on Glau's character.)