This episode was... eh. Then again, I didn't really expect much.
Firstly, I think the idea of reading ANYTHING makes you an "egghead" is... pretty stupid. I literally laughed out loud at Twilight's comment about "not reading doesn't make you stupid".
...Which it doesn't, I know there are illiterate people out there and that's a serious problem and I'm sorry for them, but Rainbow Dash can clearly read. Reading excessively is one thing, but reading for fun? Also, Rainbow Dash should have realized that her friends thought the idea of her being an "egghead" just for reading that one book is ridiculous, by the way they dismissed her original comment.
So that's my main problem with the episode, Rainbow Dash's line of thinking is... pretty silly.
Other than that, everything else was okay. The story of Daring-Do was... like a cliched Indiana Jones story, just with some tribal leader-looking guy as the ultimate "big bad" instead of... well, Nazis and Communists. The traps were interesting, I suppose, but I noticed something...
The trap Daring-Do triggers right before the predator/rat trap, she makes a groaning noise... And yet her lip movement looks like she's trying to say something... Like an "aw shoot" or something.
In that same vein, I noticed that when Rainbow Dash was given her food, Applejack says something to her, but her lips don't move.
One last thing I wanted to comment on, when Rainbow Dash pretends to sleep for Twilight and Fluttershy, her mouth is... really big. Like it takes up over half her face! Yeah, strange animation goofs in this one.
Also, Pinkie Pie yelled something while Rainbow Dash was being chased... I couldn't make it out, what was it? Does anypony know?
So yeah, initial reaction: okay episode.