First Disney Channel Original Movie that's a sequel to something that wasn't a musical in any way since Twitches Too (2007), which coincidentally is also Halloween themed.
This is the first Sequel to a Disney Channel Original Movie to premiere only a year after the previous film in the franchise since High School Musical 2 (2007) in 2007.
First Halloween themed Disney Channel Original Movie to not premiere in October when Halloween itself takes place. It's also the first Disney Channel Original Movie in general to premiere in September since Camp Rock 2: The Final Jam (2010) 12 years prior.
First Disney Channel Original Movie since StarStruck (2010) to premiere on a day of the week other then a Friday.