- 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 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 Amy Adams' Junebug (2005).
- 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 (1978), which was produced by his father Ivan Reitman. 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.
- All of the phone numbers begin with 55501 (which are the only numbers now reserved for movie/TV use) except for the number Juno dials early in the movie, which begins with 5555.
- In a deleted scene featured on the DVD, Juno and Leah run into Mark at a video store. Director Jason Reitman's previous film Thank You for Smoking (2005) can be seen on the shelf in the background.
- The compact disc from which Mark plays "Superstar" by Sonic Youth is "If I Were a Carpenter", a 1994 compilation of covers of The Carpenters' songs.
- Jennifer Garner dropped her A-list salary to a percentage point agreement for Juno when it was expected to be a small, low grossing indie film, but the decision paid off when Juno became a breakout smash at the box office - giving Garner her best payday yet.
- Brad Silberling was originally set to direct but left over creative differences.
- The scene where Juno pulls the van over and cries on the side of the road was added after filming had already been completed and Ellen Page had gotten a hair cut. She is wearing a fake ponytail and her long bangs were trimmed into more of a face-frame cut that is visible in the shot.
- Ellen Page came up with Juno's hairstyle of the ponytail with long bangs on the sides of her face and did her own hair every day.
- It was challenging to show all four seasons within a 30-day filming schedule. Solutions included digitally darkening spring cherry blossoms to look like summer flowers and having crew members off camera throw falling silk leaves for autumn. There was a fluke snowstorm (unusual for March in Vancouver) and three different shots were coordinated that day before the snow could melt. Since fake snow can be expensive to put in a shot, this saved the film considerable money for the winter scenes.
- Olivia Thirlby originally auditioned for the lead but was eventually cast as "Leah".
- Several of the actors in the film have appeared in movie adaptations of Marvel comics. Ellen Page played Kitty Pryde in X-Men: The Last Stand (2006), J.K. Simmons played J. Jonah Jameson in the Spider-Man trilogy, and Jennifer Garner played Elektra in Daredevil (2003) and Elektra (2005).
- Director Jason Reitman mentions on the DVD audio commentary that several objects in Bleeker's room, including a Hebrew alphabet poster on his door, a framed Bar Mitzvah certificate on his wall, and a dreidel on his shelf, are supposed to indicate that Bleeker is Jewish.
- There is a Korean film by the same name, which also features a young girl who becomes pregnant by her boyfriend of the same age. However, the stories are vastly different.
- When Bleeker says the line "She smells like soup", it's the same reason Mike Myers' character broke up with a girl in So I Married an Axe Murderer (1993).
- Juno is filmed from the rear wearing a red-hooded top, referencing Ellen Page's starring role in Hard Candy (2005).
- Juno's mysterious band-mate "Tino" should be a familiar reference to fans of the short-lived TV show "My So-Called Life" (1994) which featured a character never seen named Tino, who started a band with Jordan Catalano (played by Jared Leto).
- J.K. Simmons was so impressed with the script that he would have been happy just to play the teacher who has no spoken dialogue - anything to appear in the film.
- Jason Reitman used the different seasons to frame the story in because he thought they mirrored the three trimesters of Juno's pregnancy.
- Jennifer Garner recommended Jason Bateman for the role of Mark Loring after working with him in the movie The Kingdom (2007).
- In Juno's locker there is a sticker for punk band Bad Religion.
- Most of the posters in Juno's bedroom are by Tara McPherson.
- Mark and Vanessa's last name in the film, Loring, is also the name of a popular park in downtown Minneapolis, Minnesota. Writer Diablo Cody lived in Minneapolis for a time.
- WILHELM SCREAM: When Juno and Mark are watching a horror movie.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: The note that Juno left on Vanessa's doorstep was written on the back of a receipt from Jiffylube.
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