Trevor Phillips is mentioned in this, as a inside joke from TREVR PHILLIPS SERIES. Cause Pinkie Pie was involved as Trevor's henchmen (Cupcakes version of her)..

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Starlight Glimmer, newly accepted student to Princess Twilight Sparkle, tries finding her way around the large castelo of Friendship. Upon finding Twilight in the castelo library, Starlight thanks Twilight for letting her stay at the castelo after everything she's done in the past. Twilight tries to help Starlight feel welcome, and as Starlight's teacher, she tries to figure out what her first friendship lessonshould be, having made extensive lists of possibilities.

Starlight: Right. Uh.. Is Saten here?

Twilight: He said he's on his way.. First he said he and Derpy had to do something.

MEANWHILE:

Derpy: I.. I don't know about this Saten.. This place is giving me the creeps.

Saten: Relax, it'll be fine.. (knocks on the door to a old, rusty looking, trailer).

Trevor Phillips: (opens his door) Hello?

Saten: (holds contact) Hi, do you mind signing this contact to legalize wee-

Trevor: (suddenly punches Saten scare in the nose, knocking him off the steps and onto the ground) I make a SHIT load of money selling that stuff! Last thing I can handle is legalism, NOW FUCK OFF!

Saten: (holding his nose as Derpy helps him up) You could of just said no!

Trevor: What's the fun in that?

Saten: Your a dick.

Trevor: WHAT!?.. (pulls out gun) SAY THAT AGAI- (Suddenly there's an explosion from inside the trailer).

Trevor: DAMN IT MICHAEL! I TOLD YOU NOT TO SMOKE IN HERE!

Michael: (off view) Eh, shut up!

Saten: Who's your friend?

Trevor: Why are you still here!? FUCK OFF!

Saten: (angrily) You fuck off.

Derpy: (nervously grabs leaves) Cousin, the guy has a gun.

Saten: Yeah, well I bet it's not real (gets nearly shot) LEAVING! (he and Derpy run off).

Trevor: (sighs and goes back inside his house) Stupid pónei, pônei references.. I hate this fuckin writer!