How does chapter 6 demonstrate Adam's melding conventions of science fiction and absurdist comedy?

The Hitchhikers guide to the galaxy, a radio screen play by Douglas Adams in the eighties. The book is a science fictional comedy. Which conventions of science fiction makes this a science fictional comedy?
The scenes are set in fantastical settings like spaceships, unknown planets or somewhere throughout time. The setting provides a background to the absurd scenes. Also characters and language are dominated over the plot line because the situational comedy can be easily used. For example special characters like computers with feelings, funny voices like mice speaking, and confusion of stereotypes. A great weight is also on the technology aspect, where Douglas Adams brings in devices like time machines, spaceships, travels across the universe, ray guns and Aliens. Arthur is also saved out of his own time by time traveling spaceship. Flexible time is another convention of science fiction. Mostly these are male dominated, Ford, Arthur, Marvin and Zaphod all main characters and there is only on female Trillian. These conventions are tools to create an absurd science fictional comedy.