Applejack's Dog Winonna was originally named Brandy, then Buckaroo
Gilda was originally named Grizelda
Suited for Success was originally called Dress for Failure
Applebloom was originally named Appleseed
Big Macintosh was originally Big Apple
Sweet Apple Acres was originally Big Apple Orchard
One Bad Apple was originally Bully For You
Carousel Boutique was originally Carousel Couture, and was an actual carousel with moving mannequins for Rarity's designs. Unfortunately the idea was rejected.
Ponyville was originally Fillydelphia
Celestia was originally Queen Celestia, and Nightmare Moon was Discord
Opal Essence was originally Ruby, but many gem stones are already trademarked for toys
Twilight Sparkle was originally Twilight Twinkle. Lauren actually wanted to name her just "Twilight", but there were legal issues there. Twilight Twinkle was also lacked due to the same legal stuff. No subtle jab at the Twilight Saga was used in the making of her final name.
Rarity's Element of Harmony was originally inspiration
Twilight Sparkle originally had dark blue hair with a light blue stripe
Diamond Dogs names are Fido, Rover and Spot (which has been revealed already)
Pinkie's Sisters weren't named, but ideas of Mince Meat Pie and Chicken Pot Pie were floating around.
Zecora was originally named "Shaman"
Bird in the Hoof was originally concieved as a tug-at-your-heartstrings style episode about losing a pet
Golden Oak Library was originally The Tree of Knowing
Pinkie Pie used to have a "Sugard Rush" power when she ate too much candy. She would plow through doors, and the Cakes had to replace theirs on a weekly basis
Rainbow Dash was originally a serial prankster, and Rob would mistakenly call her a "he" in meetings
Luna's original name was Selena
Scootaloo was originally supposed to get in a lot of schoolyard fights over not being able to fly
Luna Eclipsed had a scene with Rarity making a pink princess costume for Luna
In Return of Harmony Applejack was scripted to climb to the top of the balloon to get to the basket to rope RD
EDIT- Traducción Made in McDohl:
Winonna, el perro de Applejack, se llamaba originalmente Brandy, para después llamarse Buckaroo.
Gilda se llamaba originalmente Grizelda.
Suited for Success se titulaba originalmente Dress for Failure (vestido para el fracaso).
Applebloom se llamaba originalmente Appleseed.
Big Macintosh en principio era Big Apple.
Sweet Apple Acres era originalmente Big Apple Orchard.
One Bad Apple se tituló en principio Bully For You (Un matón para ti).
Carousel Boutique se llamó originalmente Carousel Couture, y en verdad tenía un carrusel de los maniquís con los diseños de Rarity moviéndose. Por desgracia, la idea se desechó.
Ponyville se llamaba Fillydelphia.
Celestia era la Reina Celestia, y Nightmare Moon era Discord (Nota de McDohl: da f*ck?!).
Opal Essence originalmente iba a ser Ruby, pero muchas piedras preciosas ya son marcas registradas de juguetes.
Twilight Sparkle originalmente era Twilight Twinkle. Lauren quería que su nombre fuese"Twilight" a secas, pero habría supuesto problemas legales. Por lo mismo se prescindió de Twilight Twinkle. Ningún toque sutil a la saga "Crepúsculo" tuvo que ver en la elección del nombre final.
El Elemento de la Armonía de Rarity era originalmente inspiración.
Twilight Sparkle originalmente tenía crin azul oscura con un mechón azul claro (Nota de McDohl: ¿¿Vinyl Sparkle??).
Los nombres de los Diamond Dogs son Fido, Rover y Spot (esto ya se sabía).
Las hermanas de Pinkie no recibieron nombre, pero se barajaron como opción Mince Meat Pie y Chicken Pot Pie (Nota de McDohl: prefiero Inkie y Blinkie, gracias).
Zecora se llamaba en principio Shaman (Nota de McDohl: duh...).
Bird in the Hoof fue concebido originalmente como un episodio de toque de conciencia sobre perder una mascota.
Golden Oak Library era en principio The Tree of Knowing (el árbol del saber).
Pinkie Pie tenía en principio el poder del "Subidón de Azucar" si comía demasiado dulce. Esto la llevaba a atravesar las puertas, teniendo los Cakes que restituir la suya semanalmente.
Rainbow Dash iba a ser la bromista oficial (Nota de McDohl: supongo que tipo "Luna Eclipsed", pero en todos los capítulos) , y Rob se referiría erróneamente a ella como "el" en las quedadas.
El nombre original de Luna era Selena.
Scootaloo en principio iba a meterse en numerosas peleas de colegio por no ser capaz de volar.
Luna Eclipsed tenía una escena donde Rarity le confeccionaba a Luna un vestido rosa de princesa (Nota de McDohl: la princesa Luna Peach...).
En Return of Harmony se escribió que Applejack tenía que escalar a lo alto del globo para meterse en la cesta y atar a RD.
