Goof: When Dr. Smith meekly ushers Quano's father toward the Robinson camp, actor Michael Ansara turns his back to the camera and you can clearly see the skull cap he is wearing.
Quano: Like father like son. Both are cowards.
Will: (furiously to Quano) You take that back!
Maureen: (to the alien ruler) I don't know about your planet, but on ours women are treated as the equal of men!
Maj. West: (whispering to Maureen) I can hear the boys at the pool room laughing now.
Dr. Smith: Now you will repeat after me "Dr. Smith is incapable of telling a lie".
Robot: Dr. Smith is incapable.
Dr. Smith: (insulted) ...of telling a lie!
Dr. Smith: (to Quano) Hostile little ruffian. Some discipline applied to the seat of your trousers is excactly what you need!