One of the songs used in the advertising was "Kings and Queens" from rock band Thirty Seconds to Mars. The frontman of the band is Jared Leto. Leto would later star as The Joker in Suicide Squad, a movie produced by Zach Snyder (the director of this movie).
The trivia item below may give away important plot points.
The character of Allomere was created for the movie, and did not exist in the books. In the books the search-and-rescue chaw was led by Barran, and the Guardians were betrayed by the overweight burrowing owl Dewlap.