Toward the end of that clip you can see 3/4 of the face of Dr. Hynek who was given a cameo in the film since he was the person who invented and used the terminolgy which included encounters of the 1st, 2nd 3rd and fourth kind.

He was my friend toward the end of his life and was working on a similar ranking of the shape of and flying characteristics of sighted and photographed unusual flying objects.