Ellen Page suggested that her character Juno would be a fan of the music by Kimya Dawson and The Moldy Peaches.
The hamburger phone in the movie is owned by the writer, Diablo Cody.
When searching for potential parents for her baby, Juno says she's looking for someone cool "like a graphic designer." In real life, both "Juno" star Ellen Page's father and Diablo Cody's ex-husband are graphic designers.
The hamburger phone also turns up in Bleeker's room, and can be seen clearly in the background.
At one point before Juno visits Mark, he is sitting at his computer reading Diablo Cody's (the movie's screenwriter) real-life blog, known as "The Pussy Ranch."
The first film released by Fox Searchlight Pictures to gross the $100 million mark at the box office.
The song that Mark and Juno play and sing together is "Doll Parts" by Hole. The song that Bleeker and Juno play together at the end of the film is "Anyone Else But You" by The Moldy Peaches.
The original title of the film was going to be Junebug, but was changed so it would not be confused with the 2005 Amy Adams film of the same name.
The pregnantly rounded minivan driven by Juno is a Toyota Previa. These were last manufactured in 1997, but are still quite common in Vancouver where the film was shot.
It was the highest-grossing film of all five Best Picture Oscar nominees (2008).
Juno was the Roman Goddess of childbirth and marriage.
Bren MacGuff, Juno's step-mom, has a nail parlor called "Bren's Ten." This is a reference to the old Bren-Ten pistol, which was Don Johnson's sidearm of choice as Sonny Crockett in the '80s TV show "Miami Vice" (1984).
The animated opening title sequence was created by a company called Shadowplay and the shots of Ellen Page walking were achieved by having her walk on a treadmill which was later removed.
The "pork swords" on the track team were achieved by hanging balls from the inside waist band of their shorts. Director Jason Reitman then asked the boys to kick up their knees as they ran so the balls would bounce.
Director Jason Reitman had intended to make the scene in which Juno loads up her tray in the school lunch line as tribute to a scene in _Animal House (1979)_ , which was produced by his father Ivan. But he decided against it because this would have changed the tone of the scene.
The tic-tacs that fall out of Paulie's mailbox were a special effect achieved by hooking a pump to the opposite side of the box just off-screen.
Michael Cera discovered that he could not successfully take a mouthful of tic-tacs and then say his lines. So he simply put the box up to his mouth but didn't ingest any of the candy.
Shot in 31 days.
The comic book "Most Fruitful Yuki" is not real. It was dreamed up by screenwriter Diablo Cody.
Juno's handwritten message in Bleeker's yearbook was actually written by Diablo Cody.