All-Star Cast: In terms of Nick stars from around the early 2010s at least- most of Nick's then major live action shows are represented by one or two actors.
Billing Displacement: In the ads, Jennette McCurdy and Ariana Grande are billed before Noah Crawford and Chris O'Neal, who play the main characters. On the film itself McCurdy receives top billing followed by Crawford and O'Neal (Grande receives "With" billing).
Dawson Casting: Most of the main actors are in their early twenties, yet play high-school students. Par for the course for Nickelodeon.
Ciara Bravo's character is stated to be a 7th grader and she was 16 when the film premiered.