This episode was the 10th episode produced and the 14th broadcast.
Reverse foreshadowing: On the list of the Big Rat's brain patterns and skills, a few names above Col. Henderson is Angela Davis (with her skill listed as "safecracker"). Angela Davis appeared in Three's a Crowd (1969), the fifth show produced but seventeenth broadcast, which to the original audience would make it appear her brainwaves were already captured before she even met Mac and Joe.