Revealing mistake: A chalk outline on the parking garage wall where the actor playing the alien that just got shot and disintegrates is supposed to place his body and limbs for the special effects (the disintegration) is visible. The actor placed his body just outside the chalk outline, and the arms were not in the correct positions.
Trivia: Dabbs Greer played an alien disguised as a Minister in this episode. Later he would play Reverend Alden in "Little House on the Prairie."