There are many references to anime tropes through out the movie. such as the beach episode trope, the Skinship Grope,Naked First Impression, and others.
When the body pillows were ordered for the movie, they were supposed to be one sided with the backside being blank. But for some reason when they arrived, they put the image on both sides of the pillow. Due to the budget, the production couldn't reorder them so the crew used what they had.
The sister, Tiffany, was written and inspired by tsundere anime characters.
During the scene where Luna discovers the mom in the woods, the crew got locked in the park they were filming at and had to jump the fence to get home when they finished filming.
Yua Nijima was inspired by anime characters such as Madoka Kaname from Puella Magi Madoka Magica, Yuno Gasai from Future Diary, and Ichigo Momomiya from Tokyo Mew Mew.