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.
Memetic Sex Goddess: Dear sweet Celestia, Button's Mom became one to a degree that she almost completely overshadows her offspring in fanart. On top of that, Word of God says her near-perpetual "bedroom eyes" are intentional.
Nightmare Fuel: The Enderman ponies from Don't Mine At Night are pretty scary looking, taking the form of tall, slim, dark-coated ponies with no discernible features beyond wide, purple eyes.
Pet the Dog: After the cease and desist drama dies down, Hasbro does this. The choice of video is strangely appropriate in a way.
Ship Tease: Brainfreeze notwithstanding, Button's outing with Sweetie Belle looks very similar to a date.
It was referred to as a date on the Ask The Crusaders tumblr, which is made by the same guy that made the video. It was the person asking that called it that, but Sweetie Belle didn't object. Also, it has been clear on there for quite some time that Sweetie Belle has a crush on him.
This also leads into another project from Jan Animations, "Don't Mine At Night" (A song/video parody of Katy Perry's "Last Friday Night", where the two are playing Minecraft together (as a play on Sweetie Belle's voice actress Claire Corlett's own appreciation of the game).