- Adaptation Displacement: Mothra is based on an obscure serialized novel called The Luminous Fairies and Mothra
- That novel was actually produced by Toho to aide in the development of the film.
- Complete Monster: Clark Nelson is an immoral businessman whose only concern is money. He has his men gun down innocent, peaceful villagers to kidnap the twin fairies they were protecting. He then has the fairies perform show after show as he enslaved them and kept them locked in a cage, even erecting a special glass around them to prevent them from communicating telepathically. He sends his men to kill the protagonists and when Mothra starts rampaging, he doesn't see it as his fault, flees from the country (gunning down a policeman along the way) and finally mocks the twins when it appears Mothra's been killed. His most vile action is the torture of a child who was trying to rescue the fairies.
- Faux Symbolism: Mothra's a life-death-rebirth entity with a symbol resembling a shining cross.
- Tear Jerker: The theme of atomic destruction and Jerry Ito's superb portrayal of cruel greed and callous disregard for the island tribe and their culture (let alone all the people inadvertently hurt or killed by Mothra in her search) make this one of the saddest kaiju films of all time, although it ends happily.