The final view of the great computer display at NASA when the many meteors appear resembles the screen in the video game Space Invaders.
Opens with credits for the faux TV-movie that begins the film. Loni Anderson, who appears briefly in this introduction, is the only actor who actually gets screen credit at the start of the film. Technically, "Without Warning" is the title of the movie-within-the-movie.
The opening credits of the initial broadcast were subtitled "FEEL FREE TO PANIC".