When Suzy is reading "Disappearance of the Sixth Grade" at the Mile 3.25 Tidal Inlet campground and continues onto "Part Two" after Sam says to read on, it is just about the exact midway point of the film: the spoken words occur at 46:59, with 46:56 left in the movie. This moment also marks the transition of the film's plot, of course, so Suzy's "reading" also informs the audience of the shift in the movie's tone and direction.
In the film, Laura Bishop shouts at various family members through a bullhorn. The idea came from co-writer Roman Coppola's childhood, as his mother Eleanor Coppola used a bullhorn in a similar fashion.
According to Jared Gilman, the scene that required the most takes was the one where he held up the beetle earrings to Suzy. Each time he did it, either the earrings weren't entirely in the frame, or he wasn't holding them correctly.
During filming, Wes Anderson rented an old mansion in Newport, Rhode Island for himself, editor Andrew Weisblum, and director of cinematography Robert D. Yeoman, in which they had a room set up for editing the film. It had been arranged for the cast to stay in a nearby hotel, but eventually some of the actors also decided to stay at the mansion, including Edward Norton, Bill Murray, and Jason Schwartzman. Murray later joked that the theory was to have everyone close by so that they could all work "ungodly art-movie hours."
According to Wes Anderson, Suzy's discovery of the "Coping with a Troubled Child" pamphlet was based on a similar experience from his own childhood: "It wasn't anything terrible. It's just something that at the time, when I found it, I was like, 'What is this!' I immediately knew who that troubled child was even though hypothetically it could have been someone else."
While Suzy's books in the movie are fake, "Noye's Fludde", is in fact a real 1957 opera by Benjamin Britten. The text is based on an edition by Alfred W. Pollard of an early 15th-century mystery play from the Chester Mystery Cycle. The opera is written to be performed by a cast primarily of amateurs, and Britten requested it be performed in a church or a large hall but not in a theatre. Hence why it is being done by children in a church.
Before filming, neither Kara Hayward nor Jared Gilman had ever seen a typewriter in person. Hayward later said, "Fran (Frances McDormand) had a lot of fun with that. She couldn't believe it. She showed me that the keys are in the same place as now (on computers)."
When Sam is surrounded by the scouts in Lightning Field, he says, "On this spot, I will fight no more, forever!", which is from the Surrender Speech by Chief Joseph of the Nez Perce tribe. In 1877, Chief Joseph attempted to lead his people on an 1100-mile journey to Canada to escape the U.S. Army. They made it within 40 miles before they were surrounded, and Chief Joseph made his speech.
During the closing credits, the voice of a young person introduces various instruments as they join in playing a song - an obvious reference to the records played in the Hayward home. This method of spoken introduction has however also been used outside of education recordings, such as in the obscure 1967 song "Intro and Outro" by the Bonzo Dog (Doo-Dah) Band where atypical and strange instruments are introduced as played by unusual and unlikely musicians (such as John Wayne and Adolf Hitler), and in Mike Oldfield's seminal 1973 work "Tubular Bells" where Part One is concluded by Vivian Stanshall as "Master of Ceremonies" crediting one by one the instruments used earlier in the piece. Co-incidentally, tubular bells are listed as part of the deconstruction of the Desplat piece.