Although it isn't acknowledged as the source, the same method of stealing a train carriage from a moving train, are found in the story, "Sir Gilbert Murrell's Picture", from the book "Thrilling Stories of the Railway" (1912), by the Rev. Victor L. Whitchurch. In the original a goods wagon containing a valuable painting is stolen using the same technique.
When George Peppard, as Banacek, tells Felix he learned combat judo in the Marine Corps, that's true. George Peppard is a former U.S. Marine.
William Windom, Percy Rodrigues, and John Fiedler appeared in Star Trek episodes. Peter Mark Richman would appear in an episode of Star Trek: The Next Generation.
The Phoenix seen in this episode is actually a modified 1969 AMC AMX 390, which was redubbed the AMX 400 after auto designer George Barris completed this one-off "Kustom" redesign.
The helicopter Banacek flies in on is a Bell 206A JetRanger with registration number N4795R.