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17: Altar Egos

Henry Winkler strikes a Happy Days pose.

Will Arnett (G.O.B.) and Amy Poehler (G.O.B.'s seal-dealing wife) were married at the time of filming.

8: Queen for a Day

Liza Minelli, who plays Lucille 2, famously sang "New York, NY." Her character remarks, "Everyone thinks they're Sinatra."

11: Out on a Limb

Julia Louis-Dreyfus, who plays Maggie Lizer, adopts Jerry Seinfeld's cadence in a reference to the infamous 90's television show they co-starred on.

13: Motherboy XXX

Henry Winkler literally jumps the shark — as he did in happy days.

G.O.B.'s wife is played by Will Arnett's then real-life wife Amy Poehler.

17: Spring Breakout

In the background, an extra jumps the shark, which is a reference to Henry Winkler (Barry Zuckercorn) and Ron Howard (announcer) on Happy Days.

2: For British Eyes Only

Brad Garrett beat out Jeffrey Tambor (George Sr.) for the "Best Supporting Actor" Emmy.

Andy Griffith costarred with Ron Howard.

3: Forget-Me-Now

Scott Baio's character replaces Henry Winkler's character — as he did on Happy Days.

5: Mr. F

Rita is played by a Yank, South African Charlize Theron. "You can always tell."

6: The Ocean Walker

Tony Hale performs a dance to Mr. Roboto, as he did in a Volkswagen commercial.

A picture of Rita before plastic surgery is actually a picture of Charlize Theron in "Monster."

7: Prison Break-In

Ron Howard corrects the name of a Happy Days star.

8: Making a Stand

Andy Richter plays quintuplets, and starred in a comedy called "Quintuplets."

9: S.O.B.s

Andy Richter plays quintuplets, and starred in a comedy called "Quintuplets."

11: Family Ties

Jason Bateman's sister, Justine, plays Jason's potential sister Nellie.

The episode is titled "Family Ties," the name of the television show that Justine Bateman starred in.

12: Exit Strategy

The actor who played the Soup Nazi on Seinfeld portrays a Saddam look-alike.

13: Development Arrested

Ron Howard is the narrator and an executive producer of Arrested Development. "Maybe a movie."

1: Flight of the Phoenix

Michael's phone calendar is stuck in 2003, the year that Arrested Development started.

2: Borderline Personalities

The narrator references the current (and unexpected) fourth season of Arrested Development: "... the beginning of a fourth season that would never come."

4: The B. Team

Barry says, "I can't reach the Chachi" in front of Scott Baio (Bob Loblaw), who played Chachi on "Jonie Loves Chachi."

12: Senoritis

An obviously older Michael Cera (George Michael) was supposedly "aged by the harsh winds of the sea" though only gone for a few hours.

13: It Gets Better

George Michael says he signed up for Netflix to see the remake of Les Cousins Dangeroux.