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.
YMMV: House of Mouse
The House segments:
Ear Worm: Boom, Da Boom, Boom Boom Da Boom! "Gram Gram used to say that?"
After one of Pete's failed attempts at taking over the club, he's forced to clean the place up. As he's scrubbing the floors dressed in Cinderella's "maid" outfit, Lady Tremaine (Cinderella's stepmother) appears behind him, looming over him with that same smug grin she uses when she makes her stepdaughter miserable. Pete is creeped out as she's doing this, and nervously laughs as he tells her to quit staring at him.
Ho Yay: At the start of the Valentine's Day episode, Pumbaa, taking Mickey's "grab your sweetie and give 'em a smooch" line seriously, puckers his lips, but Timon tells him, "Don't even think about it!"
Timon: "Actually, no one asked the opinion of Gaston."
Subverted when one of the characters mentioned shutting up. Gaston launches into it before saying "Nevermind".
Narm: Near the climax of House of Villains, while Mickey is trying to battle said villains, Aladdin shows up outside the door for about three seconds, tosses in Jafar's lamp, then flies away on Carpet. It's very abrupt.
"Donald's Halloween Scare", where the nephews scare Donald by disguising themselves as pretty convincing zombies.
The Scrappy: Shelby Turtle, the annoying little hellion and Karma Houdini that has gotten away with tormenting Donald and Mickey, is this in both the House of Mouse segments and the Mouseworks toons. His mother is also definitely one as well.
They Wasted a Perfectly Good Plot: Mickey's House of Villains - The advertised plot of the villains taking over the House takes a back seat to the cartoon shorts contained within. Then at the end, Mickey and Jafar have an anticlimactic battle which results in all the other villains fleeing in terror simply because Mickey's figured out Jafar's weakness.
And it took 3/4 of the movie to even get to the takeover, with it just sometimes cutting over to their table with Jafar reminding everyone to wait for midnight.
In House of Villains, after taking over the villains just show two shorts that are scarier than the ones Mickey used.
The Headless Horseman, like Gaston he was pretty much turned into a living Running Gag, his was that he had no head and can't speak. Really sucks the scary out of him.
What an Idiot: A minor one, but one has to wonder why they keep Gus Goose in their employ given his tendency to eat the food meant for the customers. Even by comedic toon standards, that seems counter-productive.
The Woobie: Dennis the Duck when Donald says that he "doesn't think he's funny". Since he idolizes Donald and being funny is literally his reason for living, he's sent into a suicidalHeroic BSOD. Don't worry, he gets better. Doesn't hurt that he's so adorable looking◊.
Foe Yay: Happens when Mickey accidentally sends Mortimer a sweet fax that was meant for Minnie.
"Funny Aneurysm" Moment: "Mickey's April Fool" has Mickey faking his own death as his prank on Mortimer. It's made into this when you take into account that Wayne Allwine (Mickey's voice at the time) is now dead.
Arguably counts for the Phantom Blot in the episode he became "The Phantom Rainbow", as he makes his first appearance in a video game, the game involves running colors but it's more... grim, in comparison.
Villain Decay: Not Pete for once, no, this position goes to the Phantom Blot, who went from an eponymous mastermind, to someone who was tired of his old cloak because it had no color. Although he arguably gets his stride back in his third appearance in House of Mouse.