@Ponka Pie  
Because Evil Cadence.

Why is this tagged anorexia?

@RIG  
Thanks.

@Background Pony #DD25  
the observer from some series called fringe

Who’s that shadowy figure on the background with a fedora and a tie?

@mcflurry  
Oops, forgot that how Good Pinkie reminds me of Pinkie Pie  
and Alternate Pinkie reminds me of Pinkamena.

Let’s see:  
Good Celestia reminds me of Celestia.  
Good Luna reminds me of Luna and my cat(my cat is pretty)  
Good Cadence reminds me of happiness  
Good Shining reminds me of loving husbands  
Good Twilight reminds me of Twilight  
Good Applejack reminds me of Applejack  
Good Rarity reminds me of Rarity and my cat again  
Good Fluttershy reminds me of Fluttershy  
Good Angel Bunny reminds me of a logo  
Good Dashie reminds me of Dashie(being freaking cute)  
Good Derpy reminds me of dogs(with the tongue)  
Normal Chrysalis reminds me of Chrysalis  
Good Doctor Whooves reminds me of Doctor Whooves  
Good Spike reminds me of Spike  
Now hop through the mirror!  
Alternate Celestia reminds me of the leader firetruck from that show on Cartoonito called Firehouse Tales  
Alternate Luna reminds me of female villains  
Alternate Cadence reminds me of gothic things  
Alternate Shining reminds me of sad people  
Alternate Twilight reminds me of Twilight being angry  
Alternate Applejack reminds me of Red Dead Redemption  
Alternate Rarity reminds me of GTA 3  
Alternate Fluttershy reminds me of cute raging  
Alternate Angel Bunny reminds me of scared things  
Alternate Dashie reminds me of cute Dashie being angry  
Alternate Derpy reminds me of Harry Potter  
Alternate Chrysalis reminds me of cutest creature on the world  
Alternate Doctor Whooves reminds me of Doctor Whooves in a different outfit  
Alternate Spike reminds me of Spike

@communistman  
It is a reference to the Observer from Fringe. He’s appeared a few times in the comics.

Just thought I’d point this out and it is just a guess but the pony on the left panel in the background with a suit/tie w/ fedora kinda gives me the “Observer” vibe from the TV-show FRINGE.

with other dimensions canon cupcake and rainbow might acually happen in other dimensions

@Background Pony #C50D  
a little too late to react, don’t you think?

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHH
 
RUN FOR YOUR LIVES EVERYONE

I love how the two Doctor Whooves are Ten and Four.

@DuskFox  
In a good way or a bad way?

Pinkie at least isn’t going Cupcakes…
 
BTW find him  

I really really want to rob a bank with Altarity and Altjack. Just sayin’.

If I could be allowed a Pick-n-Mix Universe I’d have:
 
Main6  
Alicorn Sprarkle  
Rest Alt-Universe
 
And both Alt Alicorn Sisters

@FloydPinkerton  
The other Shining looks sad and oppressed. Our Shining is happy, and only oppressed in the bedroom.

Well both Spike and Shining seem to be the same.. At least I can’t see any difference…

Except the Doctor in the evil universe is Jack Kine.

And somewhere behind this, the PONY.MOV universe lies beyond it.

200+ comments and I’m the only one to make mention that Cadance’s cutie mark has actually changed more than a little bit?

Its interesting that Chysalis seems like the only one who looks age-wise different.
 
I mean that DOES make a lot of sense. A being as powerful as Chysalis probably has as much control over their age(or non aging) as Celestia and Luna. Chysalis looks around mid 20s while this anti-Chrissy looks like the proper age of our notion of a ‘queen’ among princesses. In a sense, she looks even more mature then Celestia.
 
Celestia, our Celestia, is already confirmed to be in the other world while Luna maintains Equestria. Wow, I’m imagining an epic 8 on 8 battle between:
 
Celestia  
Rainbow Dash  
Twilight  
Pinkie Pie  
Applejack  
Fluttershy  
Rarity  
and Anti-Chrissy
 
vs
 
Anti-Celestia  
Anti-Luna  
Anti-Rainbow Dash  
Anti-Twilight  
Anti-Pinkie Pie  
Anti-Applejack  
Anti-Fluttershy  
and Anti-Rarity

@Background Pony #CD2E
 
Not to mention how the “Friendship is Magic” tagline is conspicuously absent

@ReadingReader  
Eeyup, that’s Observer allright. Andy is a fan of the show so he sticks them in nearly all of the big pictures he makes, so keep an eye out for them. This guy plans to hang around.