Adam Brooks' character Mr. Buechler is named after the late John Carl Buechler who directed and provided the special effects for several little monsters films that Frankie Freako pays homage to like Troll (1986), Ghoulies (1984) and Demonic Toys (1992).
Frankie Freako likely took inspiration from Freddie Freaker, a goblin-like puppet that appeared in TV ads in the 1980s for a dial-a-joke hotline. Freddie Freaker ads resurfaced on the internet during the 2000s and became a meme due to its odd character and catchy jingle.
Munch uses a freakiness detection machines that has red lights that flash when someone is revealed to be "freaky". Kristina drives a red car, which is probably a foreshadowing of the reveal at the end that she is a longtime friend of Frankie and the other freaks.