Murdoc was unfamiliar with the XP-59A Airacomet. When the test planes were on the ground, they were sometimes fitted with a false prop to disguise their true nature. Below is a photo apparently showing an XP-59 fitted with one:
Murdoc seems to remember an episode of the old Wonder Woman televsion show where a jet prototype was shown. At the time I thought it was a bad mock-up of a P-80 Shooting Star, but now I wonder if it was actually an XP-59.