Ryder Dueck (Director) reached out to Erik Griffin if he wanted to make a cameo in his film. He later said yes to the idea and did the cameo for free.
When Dylan was smashing Tonya's head into the piano, that was a reference to Quieten Tarantino's Once Upon a Time in Hollywood ending.
In the beginning when Dylan was talking about the ancient machine gun called the Hustle Buzzer, later on Gwen is shown with a machine gun that was supposed to be the Hustle Buzzer.