1)"Everyone seems to know everything about everything apart from me." That's the story of my life.
2)"You have reached your destination." When did the TARDIS get a GPS system?
3)"Even my incredibly long life is to short for Les Misérables."
4)"There's no such thing as an arborial coincidence."
5)"I haven't got an imagination, you can ask Miss Oswald." I get the feeling that Clara's not really a very good teacher.
6)"The forest is mankind's nightmare."
7)"You're know they're not really gifted and talented. I just tell them that." Yeah, at some point there need to be an episode where Clara gets fired by the school system.
8)Kitty! Big kitty! "There are very good, solid scientific reasons for being really quite frightened right now."
9)"Leave them at a space academy for the gifted and talented?" A reference, perhaps, to the final fate of John and Gillian from the 60's Doctor Who comics?
10)"I don't want to be the last of my kind." Ooh, burn.
11)"I am Doctor Idiot!"
12)I'm not wild about the whole "the trees as protectors" gimmick. It's a little too "magical thinking" for me.
13)"Class project - save the Earth."
14)"Now that was surprising. I love surprises." Her again.
15)"The human superpower - forgetting." I call BS on that. People are NOT gonna just forget something like that. It's like that awful old War of the Worlds TV show, where we were expected to buy that the human race had largely forgotten the Martian invasion.
16)Wait, so where was Maeve's sister all this time? Narnia?
Overall: Another so-so episode. I like Capaldi's Doctor, but he's not getting the best writing. I hope he doesn't become Colin Baker Jr. and get booted for things that weren't his fault.