Arrested Development is pretty much the greatest comedy ever.

Few gags I found on the internet, after some research -
1. Tobias is an albino black man:
There are references to Tobias being a black man sprinkled throughout the show. Here are a few:

Tobias: I am surprised that she’s going after somebody so similar to my own type.
(in reference to Lindsay flirting with Ice the Bounty Hunter, from the episode “Good Grief”)

Lindsay: People hear the name Tobias, they think ‘big black guy.’
Tobias: Well, obviously, I’m not a big guy. I’m not a Carl Weathers, par example. (from the episode “Afternoon Delight”)

Lucille: Michael. I was almost attacked last night in my own home. I walk in and there’s a colored man in my kitchen.
Michael: “Colored?” What color was he exactly?
Lucille: Blue. (from the episode “Afternoon Delight”)

Lindsay (to Maeby): I don’t know where that hair of yours came from. (in reference to how Maeby’s frizzy hair hurt her chances in child beauty pageants, from the episode “Notapusy”)
And then, there’s the cover of Tobias’s book, The Man Inside Me:

The gag about Maeby’s alter ego Surely’s name being a play on her own name is a pretty obvious one, but another of George-Michael’s love interests, his ethics teacher Miss Barely (Heather Graham), also has a name that plays off of Maeby’s.

In “Let ‘Em Eat Cake,” a whiteboard at the hospital says the head nurse is named “Ratchet,” a reference to One Flew Over the Cuckoo’s Nest.

In “Meet the Veals,” when Maeby is reading a movie script titled “Operation: Hot Mother,” the same name of Buster’s plan in “Motherboy XXX.” The script also mentions that it’s “based on a true story.”

Steve Holt! I mean..

How I love Michael Cera's expression at the back.

In “Development Arrested,” a newspaper article appears onscreen about Rita landing a job as a movie executive. If you look closely, you’ll see a smaller headline beneath it that reads “TV DVD Sales Enjoy All Time High.” So, the show’s final episode featured a reference to how well DVD sales are doing for the show, which you can only notice if you pause the scene on DVD.

Michael refers to his employees as sheep in the episode “Staff Infection.” Later on, when he means to send them to lunch, they accidentally board a bus that Lupe reserved for her family, which is labeled “Church of the Good Shepherd.” One of the employees who is always in the back of the group is wearing a black shirt (black sheep). Also in that same episode, when George-Michael finds the folder of his old school projects in Michael’ s office, there’s an art project of a sheep made of cotton-balls on top.

The titles of the first three episodes of Season Two are references to the show Friends. Every episode of Friends was titled “The One Where…” with the episode’s plot making up the rest of the name. The first two Season Two AD episodes were “The One Where Michael Leaves” and “The One Where They Build a House.” The third, a Mexico-set episode, was called “Amigos,” which is Spanish for “friends.”

The source for these is the article [1], which has 53 inside jokes from Arrested Development. A must read.

[1] http://splitsider.com/2012/08/53-arrested-development-jokes-you-probably-missed/

In episode "Mr. F", the family is in the conference room with Bob Loblaw and he tells them "This room, or someone in it might be wired for a listening device."...and the production's boom mike dips into frame.

Another favorite one: In the sequence when Gob is trying to swallow the key for his prison escape in the model home kitchen, he begins by dropping the key in a shot of Jameson, upon which he gags. He then tries to swallow the key and a shot in rapid succession, and fails again. Then he buries the key in a piece of meatloaf, which he fails to swallow but tries to chase quickly with a shot of vodka...and the ordeal quickly devolves into a series of quick cuts of Gob, shirtless and drunk, mixing drinks from two bottles in his mouth, seemingly having abandoned the process of swallowing the key in favor of inebriation in a simulated fervor that few can achieve quite like Will Arnett. Just before the crescendo of this scene, a small disclaimer appears on the bottom of the screen: "Professional Magician. Do Not Attempt." It took a few viewings of this episode to even notice it, but when I did finally see it, I almost fell off the couch...

I love the scene where the publicist Michael was dating goes to talk to George Michael at the banana stand, and she asks him "Are you happy with yourself?", and George Michael thinks she's talking about something else and responds "Yeah, I mean I got him away without hurting his feelings" and the camera cuts to a bum looking very sad holding a balloon that says "Bluth's Bananas".

Later in that episode there's a newspaper with the headline: '"The Cold Hard Bluths" said, "Bum Gets Balloon."'.

In season 3, episode 11 ("Family Ties"), when Buster is in the hospital faking a coma, a congressman shows up to keep his family from pulling the plug -- which Lucille refers to as "cutting the cord", a reference to her and Buster's lack of boundaries. After the cutaway showing that it was Buster who called the congressman's office to anonymously report his family's intent to "kill Baby Buster", we see him from a low angle wearing a big smile:

This is probably a Peanuts reference, a number of which dot the series -- for example, Buster repeatedly refers to his genitals as his "Linus" and "Charlie Browns". Buster's countenance here echoes Schulz's famous drawing of Charlie Brown and Snoopy dancing:

Per the FCC, the cast had to cover their mouths whenever they swore. A running joke was how they ended up doing that (hands, mugs, plants, pixellation)

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referencing:

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Franklin's shirt says "George Bush doesn't care about black puppets". (see: http://en.wikipedia.org/wiki/A_Concert_for_Hurricane_Relief#Controversy)

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This comes about ten minutes before Buster loses his hand. There's the seal that's gonna take it.

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This comes about five seconds before Buster loses his hand.

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Spot the "also bought"

Barry Zuckerkorn jumping the shark:

A reference to the episode of Happy Days where The Fonz jumps over a shark:

In "Prison Break" there's a flash back to the family trying to agree upon a cause for the first TBA fundraiser. George is reading off "anonymous" ballots cast by the family. When George reads "ovarian cancer" on one of the card he remarks "Gee I wonder who that was" and the camera pans to Michael looking sad, implying his wife died of ovarian cancer. Another example of the family being insensitive to Michael's wife dying.

In "Staff Infection" (shortly after Annyong's first appears), Michael goes looking for his son at the banana stand. Despite the fact that the narrator is speaking at this moment and you can't hear what any of the characters are saying, we still get Annyong's response in subtitles.

This is more of a reference question, I think. I looked the question up, and immediately found 398 Arrested Development Jokes You Probably Missed.

That specified, until someone corrects me, I don't think this little gem is mentioned: Tobias made a friend from his “Method One” acting class, a woman named DeBris. Of course, debris is a fancy word for trash, and that accurately describes her. So now, flash forward to the Quatro de Mayo episode (the season finale, I believe), when a strung-out DeBris falls into a pile of trash next to a waste bin labelled “debris”, with the word stencilled right over her head!