The Main Shark's name is never uttered in the movie, but it's Caitlyn.
The two sharks on the "Best Chums!" T-shirt Matthew and Jason wear at the end of the movie have been drawn by Matthew Ellsworth.
Bernardo (Matteo Molinari) makes twice an exaggerated "okay" sign to the camera. This is an homage (but mostly, he blatantly stole it) to singer-actor-director Adriano Celentano who, in a video of his 1972 song, "Prisencolinensinainciusol," makes that ridiculous "okay" after his wife Claudia Mori makes her solo. When Jason Ellsworth and Matthew Ellsworth saw the video, they laughed uncontrollably at the total lack of subtlety of the gesture, because it was so... "Bernardo" - hence, it's in the movie.
Shot in 21 days between May and June 2017.
The car used by Josh (Josh Sterling) is actually Matteo Molinari's car. The car used by Matthew (Matthew Ellsworth) is his actual car.