Chalkboard: I am not smarter than the president

Couch gag: The family takes place on the couch. A photographer comes in and takes a picture, which sets off a chain of future family photos. The family is normal in 2006 and 2007, Homer is gone in 2008, Marge marries Lenny in 2009, Lenny and Carl take care of the kids in 2010, Marge returns and marries Jimbo Jones in 2011, Homer returns as a robot in 2012, and all the Simpson family members are robots in 2013.

Springfield Tire Fire sign: Now smelled in 46 states.

The magazine upon the belly of the sleeping toll booth guard is the Playbooth.

Homer has the following books on his table at the library:

• Springfield lifeguards of the 20th century
• Springfield night watchmen of the 20th century
• Springfield fry cooks A - E

This is the 366th episode of The Simpsons. Now there is an episode for everyday of the year, including leap year.

Marge: I've never noticed that sign before. And I'm a very good noticer!

Carl: Hey, if she's not paying I'm not paying!
Lenny: And if you're not paying I'm not paying.
Carl: Of course you not. We're in the same car.
Lenny: Oh, I just wanted us to start talking again.

Quimby: No one is using the toll booth. (He looks through the spyglass at the sleeping guard) Dammit! We need those 75 cents to depython the town fountain.

Quimby: Get those cheap-skates through that toll by any means necessary.
Wiggum: Got it! No survivors. (He cocks his shot gun)
Quimby: No shooting!
Wiggum: But it's already cocked.
Quimby: All right, shoot it in the fire place.

Sideshow Mel: My tires has been severely damaged. The prophecy has been fulfilled! (He points his finger to the sign that says: "Do not back up. Severe tire damage.")

Marge: Lisa! I'm not sure that letter is age appropriate reading. Why can't the government edit our mail like other countries?!

Mona Simpson wasn’t living at the Simpson’s house at the time the old letter was sent, so the letter shouldn't have been delivered there in the first place.

The Playbooth magazine is a hint to the Playboy, an adult magazine founded in 1953 by Hugh Hefner. Read more about the magazine in the wikipedia article.

Ralph says he is C3-D2, which is a parody of R2-D2 from the Star Wars films. Read more about the android in the wikipedia article.