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.
Ensemble Darkhorse: Burt Gummer is the number one fan favorite character, and the only one to appear in all five adaptations (sort of).
Harsher in Hindsight: Try listening to one of Burt Gummer's rants about the government collecting people's information after hearing about the NSA scandal and the IRS targeting of political targets, and see if you still find them funny.
Hell Is That Noise: In Aftershocks, that wailing noise a Graboid makes before the Shriekers emerge. For that mater, the sound that the Shriekers make themselves. Its extremely loud and acts as a dinner bell for the dozens of other Shriekers nearby.
Ever wonder what the full name of "Desert Jack" from Tremors 3 was? The titles reveal it's Jack Sawyer.
In the first movie, after sending the final Graboid over the cliff, Val yells, "Can you fly?!" Two movies later and...
Val makes a remark that everyone knew about the Graboids and simply didn't tell Earl. He was being Sarcastic, but then came the fourth movie.
I Am Not Shazam: The monsters are called Graboids, not Tremors. Lampshaded in the third movie. The film title refers to the tremors, miniature earthquakes, caused by the monsters tunneling through the ground near the seismic sensors. Blame Pop-Cultural Osmosis Failure for people thinking the monsters were called Tremors.
The Scrappy: Melvin and Grady, both in and out of universe.
Sequelitis: An interesting case. The first movie was basically a semi-Black Comedy with Kevin Bacon. Not having to pay Bacon's salary meant the second could afford lots more Stuff Blowing Up. The third is notable for reassembling the entire (surviving) supporting cast of the first, with no characters Put on a Bus. Each movie has its own style. The first two are (relatively) serious monster movies with a healthy dose of comedy, the third puts more focus on comedy than seriousness, and the fourth is more serious than the first two with very little comedy.
Special Effects Failure: Happened a lot in the series and the later movies. Primarily the third and fourth, largely due to lower budgets.
Harsher in Hindsight: Messerschmitt's escape from 'Sigmund and Ray' in "Blast from the Past", during which the ass-blaster devoured two of his keepers, comes across as a lot more morbid after Roy Horn, of the actual Siegfried and Roy, suffered a career-ending mauling by the stage-magic duo's white tiger Mantecore. The gruesome on-stage accident took place six months after the episode's airdate.
Mis-blamed: The TV series often gets the blame for the cancellation of Farscape, which earned it a great deal of backlash. However, the series was actually picked up two months before the Sci-Fi Channel's decision to cancel Farscape (which at the time had a contractual obligation for a fifth season). In fact, Tremors was originally set to premiere in January 2002 (alongside the final half Farscape's fourth season), but was delayed to that summer months after Farscape concluded in March due to special effects delays.