The comet is named "Clarke," in a tribute to the late Arthur C. Clarke, author of the 1993 novel "Hammer of God," which describes the impact on Earth of a planet-killing asteroid. The novel predates the movies Armageddon (1998) and Deep Impact (1998), which deal with similar events.

During the first explosion at the house, windows are breaking all over; in the next scene inside the house, there are no broken windows anywhere. Again at Grandpa's house, there is an explosion and broken windows, but inside the house where Nathan is, there are no broken windows.

Featured in Chris Stuckmann Movie Reviews: Greenland (2020)