when the Interpol officer comes to the Hart residence to speak with the Harts, there is an exterior shot of the house clearly showing only the Rolls in the driveway. When the officer leaves, you hear him start his car to drive away. what car?
As Jennifer, Stefanie Powers keeps her fingernails rather short. The nails of the hand waving the championship ring are much longer.
when Jonathan is fighting the bad guy in the taxidermy shop, we get a very long, straight on look at a stunt double who is CLEARLY not Robert Wagner.
Near the end of the episode, Jennifer brings a championship ring to the polo match, waves it in the air to show Jonathan. Fernando sees her, touches his throat to realize it's missing. Didn't he notice it was missing when he dressed for the match?