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: Felix the Cat: The Movie
Accidental Innuendo: When Pim first shows up at Wack Lizardi's office with the bag, Wack asks "What in Zill have you got to be excited about? Did someone invent enlarging pills?". (It's meant to be a crack at Pim's height.)
Nightmare Fuel: The opening Felix head, as well as Oriana being chased by the Cylinders early in the film.
The trees which sprouted what were essentially black and pink flying jellyfish.
The Headhunters.
The circus, especially when Who is the Boss? is performed. Also, Wack Lizardi. Just... Wack Lizardi.
Anvilicious: The ending, as well as the book which is revealed to consist in its entirety of "Truth, Love and Wisdom". The Duke did not take it well.
Ass Pull: The Master Cylinder. Also an Anticlimax Boss owing to the Ass Pull pulled immediately after.
The fact that a tear from the Princess activated a machine and traveled to meet Felix is definitely one of these.
"Who Is The Boss?" is also good. Note that the other musical numbers don't get brought up when discussing this film...
Cult Classic: Sure, there's a lot of problems, but it's so impressively weird that it has a small following even now.
Designated Evil: We're never told what the Duke of Zil originally did to be banished from the kingdom...his only "crime" that we're shown was creating the Cylinders, which he thought would revolutionize labor. He was jealous of the king, who he considered weak and backwards, but there's no indication that he was planning to take over the kingdom before he was banished. Oriana does state that he wanted the Book of Ultimate Power though, so he may have only been using the "labor robots" to plan a coup.
Uncanny Valley: The Princess, especially when she's giving Felix exposition in her room. Her eyes are staring at the exact same spot and seem to move independently of her eyebrows and jaw, leading to some freaky expressions...or her looking like she's high.
To be fair, she was Rotoscoped, which has a high probobility of going incredibly wrong.