@Background Pony #A815
 
@Background Pony #4DE5
 
All we need now is a three stooges cameo.

@Background Pony #3ADC  
green elbow piping

@HJSDGCE  
Main Villain form the show MST3k
 
Sent a Janitor up into space and made him watch bad movies with two robots.
 
Later did it to a temp worker when the Janitor escaped.

@Background Pony #3ADC
 
Looks like green elbow piping or a Goomba’s Shoe

Heh. Mario pony’s cutie mark is a mushroom. What’s Luigi’s, though? I’m out of the loop when it comes to Mario references.
 
 
@Alue14
 
D’you mean the fact it’s sleeveless? Or that it seems to be more like a vest than an actual uniform?
 
I personally suspect it’s a sort of casualwear. Princely casualwear.

@d715  
Who’s that?

@HJSDGCE  
whys is Dr Forrester here?
 
Reference

Why is Mario and Luigi here anyway?

I don’t know if I’m the first, but what’s up with Shining’s uniform?
 
I’m not sure if this uniform is Shining’s actual uniform, or just his service uniform…
 
It just seems to be too short for practical use…

More serious than berries and flugelhorns?

mario and luigi lol

@kircher  
 
Look at that nose, and then the pony. I’m definitely calling that as the reference until told otherwise. :)

Push the Crystal Button, Frank.

@Masem  
Ah, had forgotten that she had done the First Doctor already. I think you are right about that being the butler form Downton Abbey, though. The expression is certainly correct!

@Weasselk  
Well, indirectly, the princess is in a different castle…

Mario and Luigi is here?! Princess gone missing?

“Hey, Prince Shining Armor! It’s me: Mario!”

“I hope the prince made LOTSA SPAGHETTI!”

In the not to distant future,  
Next Sunday AD,  
There was a royal alicorn,  
Just as nerdy as you or me,
 
Twilight Sparkle went down to see her bro,  
To the Crystal Empire so away she goes!  
She visited her brother at his crystal place,  
But the council didn’t like her so they shot her into space!
 
(LET…ME…DOOOOOWN!!!!)
 
“We’ll send her cheesy movies!  
The worst we can find! (lalala)  
She’ll have to sit and watch them all  
And we’ll monitor her mind!”
 
Now keep in mind Twi can’t control  
When the movies begin or end  
Because she used the extra parts  
To call her royal friends!
 
ROYAL ROLL CALL
 
TIA! (I’m a princess!)  
LUNA! (Did I miss something?)  
OWLICIOUS! (hoothoot)  
SPIIIIIIKE! (I’m helping!)
 
If you’re wondering how she eats and breathes  
And other science facts (lalala)  
Just repeat to yourself it’s just a show  
I should really just relax
 
For Equestrian Magic Theater 3000!!!! (TWAAANG!)

@kircher  
Oh, wait, I see what you mean, with the orange-ish pony. Still, she’d done the first Doc with a green coat before, no reason to change that.

@kircher  
I think the two in that 3rd and last panel are the same character. Also, Amy Mebberson has drawn the First Doctor before, over here >>425287 so I don’t think that is him either, though the dress matches the period piece.
 
The only other thing that might be the case, but I don’t watch the show to confirm, is the butler from Downton Abbey (the actor for it certainly has the bushy eyes but his hair is off).
 
Maybe we’ll get a few more hints in subsequent pages.

Mario and Luigi?  
A MUCHO CATETO!

spoiler: the story ends with Twilight getting conked on the noggin and shot into space.

A command economy…