Factual error: The film is mostly set in Moldova. Early in the film, the general remarks at one point that insurgents are near the Russian border to the north. However Moldvoa does not border with Russia at any point in its geography. It only borders Ukraine and Romania.
Plot hole: It is stated that the "specters" are actually made up of Bose-Einstein Condensate, and that they are so exceedingly cold, they instantly kill whoever they touch, presumably via shock. This is all good and well, except that if they are so cold that they could instantly kill a person, there should be physical signs of their exceedingly low temperature around them or at very least on their victims. If nothing else, at least some frost buildup around them when they stop for more than a few moments or discoloration on the skin of the dead.
Other mistake: When Clynne is making the new weapons to defeat the thingies, at one point he uses a white 'hot-glue gun' as an electric screw drill, even with added drill sound effects.
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."
Trivia: The film was originally produced by Universal pictures in association with Legendary Pictures with a planned theatrical release date in Summer, 2016. The film was then pushed back to a Fall release, before Universal suddenly opted to pull out of the project. Legendary subsequently sold the rights to Netflix, where it debuted as a Netflix Original Movie.
Sgt. Comstock: Oh, you haven't seen it. I've seen it.
Capt. Sessions: You know I believe in God, John.
Sgt. Comstock: This is the opposite of God.
Clyne: I think you're reaching.
Fran Madison: Our business requires us to make suppositions.
Clyne: My business requires us to prove them. Your technician's job is to find glitches, so, he sees glitches. Your job is to find the enemy, so, you see the enemy. Locals believe in spirits, so they see spirits. Everyone is biased in one way or another. So, my answer to you right now is that we lack data to support any theory.