Shelby mentions people from Miami, Wisconsin and Chicago heading to the Spooktacular in New York. These are where the Other Live Action Disney Channel Shows at the time had taken place for Austin & Ally (2011), Liv and Maddie (2013) and I Didn't Do It (2014) respectively, where they also had characters attending that event in New York (the setting of Jessie (2011) and Girl Meets World (2014) at the time). Only place not mentioned attending the event is Washington, where K.C. Undercover (2015) takes place.
First GMW and Best Friends Whenever crossover.