"Raddion" is an anagram of "android".
"Sesmar" is "Ramses" spelled backwards.
Penny sings, "Soldier, soldier won't you marry me?" In that song a deceitful soldier tricks a trusting maid out of her grandfather's coat, hat, boots, and gloves.
Don mentions "Cloud Cuckoo Land". Around 400 BC, Aristophenes wrote a play, 'The Birds', in which a hair-brained impossible scheme drove the plot. Since then "cloud cuckoo land" has been used to denote a place or state of mind where harsh reality is ignored but a pleasing and unsustainable fantasy in persued.
The golden oversized Raddion was played by stuntman Dawson Palmer who was the resident monster on all Irwin Allen productions because of his height. This is actually his 11th "appearance" in Lost in Space (1965), he would appear in the show another five times before it was canceled. Palmer himself would be killed in an automobile accident six years later at the age of 36.