This is a tad late, but...
Ya know how much Mare Do Well resembles
Darkwing Duck, right? (Hell, there was even a Nega Mare in the drawfriend post in EQD after the episode aired)
Just thought... If Dash took the costume for herself, she'd actually be closer to how Darkwing acted, what with her catchphrasing ("I am the terror that flaps in the night!") and
ego so large the sky is the only place large enough to hold it.
Oh, and on another note...
We all know AJ is pretty damn strong and Twilight's magic is HAX caliber.
But Pinkie being a ninja has mostly been a joke on her non-sencical ability to appear in improbable (and impossible) places. Then the construction site falling apart? That was Pinkie, showing how to
really use
Pinkie Sense in a competent way. While doing barrel acrobatics.
And a third note: How did the accident rates increase a hundred times for the few days that episode took place for?
True there was the part with Dash trying too hard and being told off about it, and Dash was the one who messed with the dam, causing it to break. But anyhow, suddenly every cart, carriage and whatever decides to go out of control and breakdown for the week?