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.
Alternative Character Interpretation: Sarah's father and stepmother. The movie wants us to think that Sarah's just being a brat in need of some growing up, but her stepmother doesn't seem to think much of her to begin with (implying she takes Sarah for granted because she's a loner, and tattling to Dad when Sarah objects to it), and her father seems either oblivious or apathetic to the obvious difficulties Sarah's having. Return to Labyrinth seems to go with this in the case of the stepmother, given that the now-teenaged Toby is having his own problems with her.
Best Known For David Bowie's Pants: Well, they probably exaggerate a little, but this is the reason most anyone remembers this movie if they aren't part of the fanbase. Either that or Jennifer Connelly looking very nice in that white princess dress she wears at the beginning.
According to the "Making Of" documentary, the scene basically came about because Brian Froud, the guy who designed all the goblins, doodled the Fireys in his sketch book, took a liking to them, and then wanted to see what they could get away with doing using Blue Screen technology.
Draco in Leather Pants: Jareth stole a baby, tried to bribe its older sister into forgetting about it, and tried to stop her numerous times when she went into the Labyrinth to rescue it, but you'll be hard pressed to find any fangirl who acknowledges that (or, for that matter, anyone who doesn't treat the Foe Yay subtext as canonical). He's a Draco in Leather Pants in the movie, too; VERY tight leather pants!
Ear Worm: Dance magic, dance, dance magic, dance! Put that baby spell on me!
Hollywood Homely: Sarah appears to have no friends, and goes on no dates, in spite of looking like Jennifer Connelly. However, the novelization notes she has at least one school chum, and her interest in fantasy worlds could well be blinding her to what she could be enjoying in the real one.
Nightmare Fuel: While The Dark Crystal has disturbingly realistic violence and alien creatures, Labyrinth goes into Surreal HorrorUncanny Valley with surreal David Bowie faces, Body Horror Fireys, the eerie ballroom scene with the grotesque masks, and almost everything being alive. Even half of the soundtrack sounds like something out of a horror movie.
No Yay / Squick: A 15-year-old being romantically pursued ("Just let me rule you...") and watched over by a stretchy pants-wearing goblin king (David Bowie at 39) makes some folks squeamish.
The scene with the "Fireys" — ya know, those fuzzy pink things that routinely decapitated and amputated themselves and others for fun — is notorious for having unusually bad Blue Screen special effects, even for its time. This is weird considering how good the special effects were in the rest of the movie. Now wispy fuzzy semi-translucent fringes are about the most difficult possible item to chroma-key, but it hasn't been remedied at all in "remastered" DVD releases. (That said, though they were far from the awesome advances we have now, it's pretty good for a bunch of puppeteers in black velvet suits.)
In addition, the child switches from a real baby to a doll a few times in "Magic Dance". note We should hope so! It gets thrown thirty feet in the air and caught by a puppet!
So Bad, It's Good: Not the movie itself, which is a cult classic on its own. But Jennifer Connelly's acting requires either very thick nostalgia goggles or an appreciation for the camp value of her breathless, melodramatic performance.
Squee: David Bowie as Jareth inspires epic amounts of rampant fangirlism to this day (and in-world, the goblins seem to react to anything Jareth says with intense cackles of delight and exuberance — though they have problems with timing), while at the same time also provoking plenty of Squick for other viewers due to the age difference between him and Sarah.
Ugly Cute: Awwww, how can you hate the lovable little goblins?
The far-more-recent manga series assigns Jareth a good - or at least not creepy - motive for the abduction, in which Jareth abducted Toby because of Toby's potential as a magician and successor, and his little game of cat-and-mouse with Sarah was simply because It Amused Me. Smells a little like Fanon, but at least it prevents Jareth from coming off as an Ephebophile.
Vindicated by Cable: The movie was a huge flop in 1986, a time when family-oriented films generally struggled to find audiences, despite several extremely positive reviews. Once it hit VHS and cable, its fandom grew to the point that it's one of rights-holder Sony's most popular films on DVD.