The movie is a narrative prequel to the Game Chasers series.
It brings back characters from the series but also introduces a new cast of characters.
Jay's shirt "Spengler High School" is an obvious nod to Egon Spengler of the Ghost Busters, so are Eric and Chief, the Ghost Getters.
Billy Chaser used to go to a game store called JAR Nintendo when he was a kid. The store from Chris' flashback is called JARRS Games.
Eric Perez actually believes in shadow people in real life.