We all knew Pinkie was a sadist from the start.
I don't mean to take a big shit on this, but I saw several errors. Not the animation but the severed heads and torture.
When something dies, magic pony or human, their eyes don't just clamp shut after the are killed, it just stops at where eyelids were at. For example, when P. (Pinkie) ripped out RD's (Rainbow Dash) heart, her eyes were wide open with fear, but her eyes closed. As far as I know, ripping out the heart or most any other vital organ, death withing seconds if not instant. RD would be screaming, crying, panicking (squirming) and going in and out of the states of consciousness, but instead, she was wide awake and only screamed and cried for 3 seconds. There was little or no blood in this, and when there was, it wasn't near enough. When the red-hot nails were implanted into her front "legs," there should have been more screaming and shaking. Now when Rd slipped out of consciousness again (finally!) and rewoke to find she was missing the majority of her skin/muscle and her ribs and vital organs were showing, she would have died before even being able to see that (dead(blood loss and such.)) Now, if you were superhuman, you could rip out organs using you own hands with ease. P. is not superhuman, just a party-loving/sadist pony. She would have needed a scalpel to cut the veins and remove the item, and even that would cause Rd. to die again, or faint (at the least!) When I got to look at her bare ribcage, I only saw the heart, not even the lungs. Rd.'s third death, lack to bring oxygen to hear brain.
Just trying to make seem a bit more realistic.
But there was some half-decent art, and the characters look real (like they look exactly the same way they do in they show (except for P.'s hair.))
I'm only giving advice you know.
I also guess it was a good idea to put warning labels, but most of us can read.
I don't like the lack of voices or even dialogue, but it must be pretty hard for a guy to do a female cartoon character's voice!