The planet Chapek 9 is named after Karel Capek who (or his brother, according to interpretation) is the writer who coined the word "robot" in 1920.
The Robot Mayor says "that makes 146 thousand unsuccessful hunts in a row," suggesting that the robots have been on Chapek 9 for exactly 400 years if they only do one hunt a day. One of the Robot Elders says that the Robot Elders were hand-carved from meteorites over four centuries ago.
The story is based on a short story by Stanislaw Lem in which a human crash-lands on a planet full of robots and disguises himself as one, only to find out eventually that all the robots are indeed humans in disguise.
Wireless Joe Jackson is a reference to Shoeless Joe Jackson, a famous baseball player in the early 20th century.
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