The episode in which Justine Bateman appears is called "Family Ties".
In "In God We Trust", Lucille Two says the line "There's places to go! People to see!" before falling down due to her vertigo and old age. This is a reference to when she starred in a production of "Forbidden Broadway". Costar Ann-Margret sings a spoof of the song "Bye Bye Birdie" called "Bye Bye Thirty", which is about aging.
There are actually several brilliant references to Liza Minelli's musical and stage career in scenes involving Lucille Two.
In the episode "Queen for a Day", Liza's Lucille Two character goes into Tobias' nightclub and hears him singing "New York, New York". She exasperatedly says, "Everybody thinks he's Frank Sinatra." This is a reference to how Liza actually recorded the song two years before Frank Sinatra.
George Michael's Season 4 plot is a parody of The Social Network, which stars Jesse Eisenberg, to whom Michael Cera is often compared and/or with whom he is confused.
A Season 4 flashback features Mort getting into trouble while the riff from Curb Your Enthusiasm plays, in a nod to Jeff Garlin's longtime role on that show.
A convoluted Actor Allusion occurs during season 4, as various characters are seen eating a weird and disgusting mixture made of Parmesan cheese and mustard. Martin Mull, who plays Gene Parmesan in the show, also played Colonel Mustard in Clue.
In the Season 3 episode "The Ocean Walker", Buster is shown jamming to the Styx song "Mr. Roboto" in the stair car. Actor Tony Hale appeared in a Volkswagen commercial featuring that song.
On-show couple Sally Sitwell and Tony Wonder are played by real-life married couple Christine Taylor and Ben Stiller.
George Bluth, Sr.: Well, I don't think the Home Builders Organization is going to be supporting us.
Michael Bluth: No, the HBO's not gonna want us. What do we do now?
George Sr.: Well, I think it's Showtime- ...we have to have a show during dinner.
Dawson Casting: Averted in the original run, but becomes jarring in flashbacks in season 4. Events that took place right after season 3's finale have characters looking much older than they looked even hours before. Even Michael Cera is not immune looking years older when confronting GOB after the Yacht party than he did when he confronted him not long earlier.
Mae Whitman plays Roxy Richter in Scott Pilgrim vs. The World, who is about as different from Ann as is possible. Coincidentally, Michael Cera (George Michael Bluth) was also in Scott Pilgrim vs. the World (he was Scott).
Jessica Walter (Lucille Bluth) and Judy Greer (Kitty) both provides voices for main characters on Archer that are pretty much the same characters as on this show (Mallory and Lucille are vain, drunken, sexually promiscuous old women who have cheated on their husbands, don't know who their children's real fathers are, and abuse their kids by crushing their self-esteem and neglecting them, while Kitty and Cheryl/Carol/Cristal/Carina are both secretaries who exhibit more than a few signs of mental instability). Jeffrey Tambor (George Sr.) has had a recurring role in the series as well.
The aforementioned Gene Parmesan, played by Martin Mull (Vlad Plasmius).
Incestuous Casting: Justine Bateman, sister of Jason Bateman, plays a character who falls in love with Jason's character. It's also played with, where Jason's character believes that Justine's character is his sister (which turns out to be false).
"Marry me!" (Pause) "That's weird on so many levels."
Real-Life Relative: Season 4 reveals that Tony Wonder and Sally Sitwell (played by the actually-married Ben Stiller and Christine Taylor) have been sleeping/plotting against the Bluths together.
Reality Subtext: A number of examples. Besides several Actor Allusion(s), there's the fact that Portia de Rossi is a lesbian and her character on the show is married to Transparent Closet resident Tobias. There's also frequent references to the show's declining ratings coupled with Biting-the-Hand Humor toward Fox. The episode "S.O.B.s" is one of the more blatant examples. Finally, the character Nellie, whom Michael apparently erroneously believes is his long-lost sister, is played by Jason Bateman's sister Justine.
More examples: the Season 2 subplot about the development being cut from 22 houses to 18 refers to the second season order being cut to 18 episodes, and the several references to musicians having rights to certain titles ("Motherboy," "Use Your Illusion," et cetera) is in regards to a lawsuit from the band Arrested Development.