The character Jamie was named after scream queen Jamie Lee Curtis.
The sign outside of Rings of Saturn reads "I like big books and I cannot lie". This is a reference to a lyric from the Sir Mix-A-Lot song "Baby Got Back".
Camp scenes were filmed at Camp Bon Temps in Breaux Bridge, Louisiana. Store scenes were filmed at "... And Books Too", a comic book and hobby store in Lafayette, Louisiana.
A copy of The Mortal Tally is visible on the counter next to Chuck at Saturn Rings. This is a book written by Sam Sykes, one of the producers (and co-author of the Twitter thread which inspired) the movie.