They filmed in Budapest due to its snowy winter, but it turned out to be the first winter in over a decade with no snow at all.
The film being shown at the cinema in this movie is "At the Mountains of Madness" which is an H.P. Lovecraft short story.
Adapted from the bestselling novel "Y pese a todo" from author Juan de Dios Garduno.
The movie was at one time titled "welcome to Harmony" which was the name of the town they were in.