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.
Dry Docking: Nikki Carpenter was introduced as a possible love interest for Mac. However, the producers soon discovered that female fans did not want Mac to be permanently attached and Nikki was quietly Put on a Bus.
Hilarious in Hindsight: Any scene containing his future Stargate co-stars, especially the one where he throws Christopher Judge on the ground. Doubly funny when his character guesses a gadget is a "Martian toothbrush."
Tear Jerker: Mike's death moments after MacGyver rejected her.
Subverted: She fell to her death during a mountain climbing expedition, and Mac's thrashing at the end of the rope as he tries to save her was rather callously added to the opening credits.