Many fans of the franchise expressed a lot of anger at all the recasting for this film, especially when it came to Rodrick, spawning the popular meme "#notmyrodrick", a parody of the "#notmypresident" trend that became popular after the election of President Donald J. Trump.

Jeff Kinney expressed interest in making the film animated.

The short script shared for auditioners feature lines from both Hard Luck and The Long Haul.

Because the release dates of this film and the previous Diary of a Wimpy Kid film are so spaced apart, child actors such as Zachary Gordon from the previous films did not reprise their roles due to being too old for their characters. Also many of the adult actors had begun working on other projects. So it was the easiest decision to invite an entire new cast for the film.

Originally Rowley was going to have a larger role in the film than in the book, in which he only appears in one flashback illustration that was in the book. However he only had a small part in the beginning and ending of the movie much like in the book. So this marks the first film where he only has a minor role. Chirag, Patty, Holly, Heather and Fregley are not shown in this film at all.

Diary of a Wimpy Kid: The Long Haul started filming on September 20, 2016 in Atlanta, Georgia and finished on November 18, 2016.

This movie uses plot elements from several Wimpy Kid books.

The actress who played the mother of Greg in the past three movies, Rachael Harris, played the mother of the new Greg, Jason Drucker, in Barely Lethal (2015).

Tom Everett Scott and Steve Zahn, who have shared the role of Frank Heffley, both starred in That Thing You Do! (1996).

Is based on book 9, however, the previous Wimpy Kid movie, Diary of a Wimpy Kid: Dog Days (2012) was based on book 4, the franchise skipped books 5-8.

The song which the parents love from when they were dating is "Wannabe" by the Spice Girls.

Several of the cards in the game the Hefleys play foreshadow events they get into, such as owning an unusual pets or meeting a celebrity.

In Diary of a Wimpy Kid 8: Hard Luck, Meemaw is dead. However, this film is based on Diary of a Wimpy Kid 9, after the events of Hard Luck, and says that she is still alive.

The altercation between Greg and Beardo in the shower is a spoof of Psycho (1960).