A blonde boy on small planet is a leading character of "The Little Prince" by Antoine de Saint-Exupéry. The planet itself, in fact, is an "Asteroid B-612".
This marks the first time Hermes meets scruffy, the janitor. Almost every time a main character meets him, the conversation goes the same:
Main character "who are you?"
Scruffy "I'm Scruffy, the janitor."
The scene where a giant worm tries to swallow delivery space ship is reference to Star Wars: Episode V - The Empire Strikes Back (1980).
The Klein Beer is in a Klein bottle. In topology it is a bottle that intersects upon itself.