So,
Too Many Pinkie Pies. Yup, just as chaotic and nonsensical as you'd imagine. I don't really think I can say much about this episode; there's just too much going on to cover every base. Pinkie being wacky, Pinkie being depressed, Pinkie being destructive, Pinkie being physics-breaky. It's got all of that and more. I'm actually really surprised that this episode didn't have some sort of musical piece; Pinkie Pie is one of those characters that I usually associate with the show's songs, but we didn't get one. Oh well, no big loss. It left more time for character development.
One thing that really caught my attention was how a character (in this case, Rainbow Dash) actually acknowledged Pinkie's physics breaking abilities. I don't think anyone in the show had actually looked at Pinkie Pie and asked "How'd you do that?" before. It was an odd moment for me.
This episode also had it share of...
freaky moments, like this:

And this:

And this:

I don't know about you guys, but that last one seemed unusually...
violent.
Overall, it's hard not to like this one, especially for fans of Pinkie Pie. You really do feel bad for her when she realizes the mistake she made and gets all depressed.