NASA uses this well thought out movie made in 1998 not only because the movie is about stopping an asteroid from hitting the earth, but because it has over 168 distinct things that are impossible to do. To reiterate, there’s an emphasis on impossible and not improbable. The list would probably be too long if one counted the improbable tasks as well.
The rationale behind the inclusion of this movie is for the team to be trained in the bifurcation of the impossible and improbable tasks. It makes sense, since the movie deals with stopping of an asteroid from hitting the earth, and what related measures were taken at each step to deviate that. This proves to be a good motivational and training tool for the NASA staff.