In a scene when Wilma is talking on the phone, it doesn't have a wire.
Fred: We wouldn't be in the army if it wasn't for you two.
Wilma: What? Do you mean to tell me I told you to join the army?
Fred: You told me to go to 75 Main Street and take a physical and 75 Main Street is the Army Recruiting Office and they give physicals there.
Wilma: (to Betty) Didn't you tell me 75?
Betty: Maybe it was 57?
Barney: All I know is it's Fred's fault.
Fred: What do you mean my fault? It's Wilma's fault!
Wilma: It's Betty's fault!
Betty: (turns around) It's your fault!
(Betty notices she's looking in a mirror)
Betty: Wait a minute. Let's do that over again and I'll start it this time.
(After Fred and Barney reluctantly leave to report for Army duty)
Wilma: How do they always manage to bollix things up, Betty?
Betty: I don't know, Wilma...practice, I guess!
This episode was recorded on 9-27-60.
The professor's name is Von Pebbleschmidt, which is a parody of the various German doctors that the American government, and later NASA, hired, following World War II.