The storyline employs every classic anime trope in existence, particularly those relating to Lost in Translation:
- Clark Kenting: After arriving on Earth, Yuusei assumes a secret identity as a Tokyo schoolboy, yet his enemies always seems to know exactly where his lives.
- Canon Discontinuity: Yuusei believes he is the ONLY alien on the planet, and is therefore constantly astonished when Tokyo is attacked by a Giant Alien Robot every other week. Also:
- Yuusei's loyal companions are Hiro and Keiko, a pair of Earth children. Despite being his closest friends, they meet him for the first time every five episodes.
- Yuusei revealed his identity to Hiro in the first episode. Yet whenever Hiro advises him to change into Planet Boy, Yuusei replies, "HOW did you know?"
- Keiko is always the first to see this week's Alien Menace. She immediately tells Yuusei and Hiro, yet they never believe her, no matter how many times she's been right before.
- For some inexplicable reason, comic relief characters are never, EVER funny.
- Yuusei constantly swears that he will never use his powers to take human life. He later uses them to incinerate a human criminal or destroy a flying warship, killing everyone on board.
- Paper-Thin Disguise: The series' recurring villain always wears a ridiculous disguise, but nobody ever recognizes him - even after he reveals himself.
- Whenever a Giant Robot attacks, the ground shakes and Keiko falls over a cliff. This can happen anywhere in the world, but somehow it's always the same cliff.
- The shape-shifting Zygons seem to invade the Earth every three episodes. The invasion always involves impersonating Yuusei's female classmates.