Originally Posted by erikun
It's different because Dash actually acknowledges that this is real, that it is a thing (the dive). Now, you could probably ignore the rest because none of the ponies react to it (that I remember, off the top of my head), but Dash asking "how did you do that?" tells us that we have no good reason to believe that her friends don't also notice all the rest (and just don't ask about it on screen). That's what has me concerned.
Pinkie having magic/psionics/whatever would be fine if it was presented as such and made to fit within the setting, but it's blatantly not. It is intentionally presented and now acknowledge IC as the utter reality defying cartoon physics that it is.