Season 4: Things you might've missed the first time through
1. Rebel Alley's son is called Lem; the space vehicle in Ron Howard's office is LEM.
2. The first time we see Argyle Austero, he's wearing an argyle sweater.
3. On the religious show co-hosted by Pastor Veal and Father Marsala, Veal announces his daughter is getting married. Marsala replies that he didn't know Veal had a daughter
Veal: "You've met her several times."
Marsala: "Oh."
Veal: "She's sitting right next to you."
(The camera pans over to Ann)
Marsala: "Oh! That's why she's there. I thought she was Hair."
Veal: "Hair?"
4. GOB and Ann are going to get married at the church of Holy Eternal Rapture, and you see large letters for the acronym, followed by what looks to be a question mark, hanging up above Pastor Veal.
5. A joke recalling what Lucille said in an earlier season - "How am I supposed to find someone willing to go into that musty old claptrap?" - and Michael taking a moment to realize she means the Bluth cabin. In a 4th season episode, after "intense and beautiful" lovemaking between Lucille and Oscar (pretending to be George), there's a small misunderstanding that occurs, resulting in Lucille slapping him for something he's said (which we don't hear), and he replies to the slap with, "N-no. I, I mean, it's good to be out of that sweaty old hot box at the compound."
6. Bob Loblaw defends Barry Zuckerkorn from charges of peeping over the gate of a school. He has Barry try to reach over the gate to unlock it, but his arm is too short. In a different episode, Barry is in the hardware store buying a short step ladder. "Cash. No receipt."
7. One of Andy Richter's brothers is named "Chareth" - same first name Michael used when he told Maggie Lizer his name was Chareth Cutestory. Also, in the photo of the Richter quintuples, under Andy, the words 'co-star 'Michael B. Project"' are crossed out.
8. We hear the "Mr. F" jingle a few times again.
9. Similarly, we hear the word "coincidence" sung a couple of times when characters (notably Lindsay) think something that's just happened contains some meaning to it.