These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The original theme by Ian Freebairn-Smith is also pretty catchy.
Crossover Ship: Almost a canon example. The end of the Murder, She Wrote crossover teased Higgins and Jessica Fletcher, although it never went past Higgins quite obviously crushing on Jessica, to her (and Magnum's) amusement.
Why is the Fifth Doctor serving as a (very inept) majordomo at Robin's Keep in England?
Hilarious in Hindsight: The bad guy in "Don't Say Goodbye" is played by Ted Danson, several years before he and Tom Selleck were two of those Three Men And A Baby. Unfortunately Steve Guttenberg never appeared on the show to complete the set.