The basement in "Most Dangerous Match" was also used in an episode of "Banacek." Same metal staircase!

The "Ransom For a Dead Man" music also shows up in "Murder By the Book" (while Ken Franklin and Lilly La Sanka are dining) and "Publish or Perish" (while Riley Greenleaf is feigning being drunk and threatening Allan Mallory.)

Ken Franklin's Mercedes in "Murder By The Book" was also Elliot Markham's Mercedes in "Blue Print For Murder". Same license plates too. However, Elliot did remove Franklin's "Have A Nice Day" bumper sticker!