@Dirty Bit  
I liked Hard Reset reference.

I think this is why she chose not to attempt to specifically alter her own past alone. the reason all altered futures were bad ones were because time needed starlight to have a reason to go back in time, like some evil dude taking over the world. maybe if they’d stayed in any one timeline for too long starlight would have had her memories adjusted to the point that she thought twilight was trying to stop her from attempting to stop nightmare moon from succeeding?

Was it a coincidence this was so close to the back to the future day? I personally like to think not

I was slightly disappointed at the lack of subtle Doctor Who references, but the episodes were good.

@TheMadMan  
“The grandfather paradox is a proposed paradox of time travel first described by the science fiction writer Nathaniel Schachner in his short story Ancestral Voices, published in 1933,[1] and by René Barjavel in his 1943 book Future Times Three.[2] The paradox is described as follows: the time traveller goes back in time and kills his grandfather before his grandfather meets his grandmother. As a result, the time traveller is never born. But, if he was never born, then he is unable to travel through time and kill his grandfather, which means the traveller would then be born after all, and so on.”
 
From the Wikipedia article. https://en.wikipedia.org/wiki/Grandfather_paradox

@Metroid Zealot
 
Actually, the Grandfather Paradox is more along the lines that you go back in time, kill your grandfather or the man you presume to be your grandfather, but it turns out you’re own grandfather because you accidentally buggered your grandmother.  
See Futurama Episode ‘Roswell that Ends Well’ for one of the best examples.

This will probably start a drama in the comments, but fuck it, I’m posting this anyway.  
MST3K Mantra

Great Scott! If Starlight Glimmer isn’t stopped, she could create a time paradox, the results of which could cause a chain reaction that would unravel the very fabric of the spacetime continuum and destroy the entire universe!
 
 
Granted, that’s a worst-case scenario. The destruction might in fact be very localized, limited to merely our own galaxy.

Sounds like a variation of the “Grandfather Paradox.”
 
Basically, you go back in time and kill your own grandfather. Because of this you are never born, so your grandfather was never killed. So you were born, so you can kill your grandfather. So you were never born, so your grandfather was never killed. And so on.