Trivia: The "Demonic Balloons" that attack the Ghostbusters are almost direct re-creations of real Macy's Thanksgiving Day Parade balloons from the 1930's. The filmmakers decided to use the real designs in order to represent the "spirits" of New York's history... and also because they were quite eerie and unsettling.
Trivia: The directors have previously worked on both Community and Arrested Development - both shows get nods in this movie. Jim Rash, the Dean from Community, plays an MIT faculty member at the start. More subtle is the Bluth family's stair-car from Arrested Development, seen briefly as Captain America walks onto the airport runway before the big battle with the other Avengers.
Trivia: The film's production was quite troubled. A crewmember named Ricardo Cornelius was killed in a freak accident when he was crushed by a Humvee and a stuntwoman named Olivia Jackson was severely injured, with her face being "de-gloved" and sustaining may injuries and fractures which resulted in the loss of her right arm. Thankfully she survived and made a full recovery and the doctors were able to surgically mend her face and other injuries.
Trivia: Brent Spiner performed the majority of his scenes alone, with no other principal actors on the set. In fact, Spiner is digitally inserted into some scenes where he appears with other principal actors.
Trivia: While no official explanation was given as to why the planned theatrical release was canceled, it has been speculated by insiders that Universal bailed on the release due to the large number of franchise-based Sci-Fi and action films being released in 2016 providing too much competition for an original property such as "Spectral", as well as Universal being leery over the project after the disappointing domestic box office of one of their other major 2016 releases, "Warcraft."