1.Looking for Alaska was published in 2005, so the show could only choose music that reflected that era of time (from 2003-ish through 2005-ish.)
2.The title cards at the beginning of each episode are meant to resemble book covers. The color and trinket change based on something in the episode.
3.The episode titles are famous people's last words, based on Miles's obsession with learning them.
4.The evil swan depicted in the show is a third CGI swan, a third real swan, and a third puppet swan.
5.The black Santas seen when The Colonel goes home for Christmas are a nod to Paper Towns, another one of John Green's novels and the last adaptation that was made.
6.Speaking of Easter eggs, there are two things on the wall near the payphone that might hint at Green's other novels. The first bit of graffiti says "Katherine <3 U," which might allude to Green's 2006 novel, An Abundance of Katherines. The second is a doodle of turtles, which may reference Green's 2017 book, Turtles All The Way Down.
7.The directors of each episode had mainly done indie movies before signing on for Looking for Alaska.
8.John Green actually attended a boarding school in Alabama, which was the inspiration for the story.
9.However, the show was shot in Louisiana.
10.Green took Kristine Froseth (Alaska) and Charlie Plummer (Miles) to the school before they began filming.
11.The show had to work some sound engineering magic in some of the outdoor shots because the bullfrogs were so loud that it was disruptive to hearing certain scenes.
12.Josh Schwartz is the showrunner of Looking for Alaska. When Miles and Lara are laying in bed in Episode 6, she plays a show on her laptop. You can hear The O.C. theme song playing before the scene changes — a nod to another Josh Schwartz show.
13.Josh said that they tried their very best to really get a lot of the "iconic John Green dialogue" into the show, especially very quotable lines like the ending, or "If people were rain, I was drizzle and she was a hurricane."
14.Speaking of that famous quote from the book, Green said he almost cut it but his editor talked him out of it.
15.Charlie (Miles) really wanted to audition for the movie after he read the book when he was 15. Originally, the book was first optioned as a movie, and 14 years later was made into the Hulu series.
16.Denny Love (The Colonel) didn't read the book until he got his audition. When he auditioned, he memorized one of The Colonel's monologues from the book.
17.Denny's favorite scene from Looking for Alaska is the barn scene because you get to know every character a little bit better.
18.John Schwartz said the biggest thing for them when making this show was ensuring that these characters stood on their own outside of Miles's point of view and that Alaska stands on her own as a fully realized character.
19.And finally, in a Q&A in the back of the movie tie-in book, Green was asked if Miles's last name has any significance. He said yes. Halter = Halt Her.