In the story about QT-1, the robot ends up behaving like a robotic Muhammad, and "converts" all other robots in the space station they are in to his religion, which worships the station's central power plant, and in which everything out of the station simply does not exist. Donovan and Powell get confined to their rooms, but it turns out that QT-1 can use the controls easily. When a new team comes to replace Donovan and Powell, the leader of the new team says he'll be damned if he lets the robot take the controls. Donovan and Powell get a laugh when they realise the newcomers will stay in the station for weeks...
The SPD model that suffers a 'nervous breakdown' on Mercury begins singing H.M.S. Pinafore: the techs are utterly mystified, since there's no real reason for a maintenance-and-repair robot designed to spend its existence on Mercury to have been programmed with centuries-old operettas.
In "Escape!", a new FTL drive is successfully constructed and tested, with a few.. side-effects.. on test-pilots Powell and Donovan:
"Does your coffin fit differently lately? Why not try Morbid M. Cadaver's extensible caskets. They are scientifically designed to fit the natural curves of the body, and are enriched with vitamin B. Use Cadaver's caskets for comfort. Remember - you're - going - to - be - dead - a - long - long - time!"