Leela was a savage. More of a stab first, ask questions later kind of woman.

Clara: Who asks for homework?

I guess Moffat decided to write what he knew, or at least what he didn't like about being a teacher.

Pregnant Amy: Can we not do the running thing?

My sentiments exactly. The reason stunt doubles are needed. If it was me, I'd have a stunt double for running. :D

Missy: I just had a clever idea.

Well, I'm going to pretend that's what happened off-screen.*thinks of naming Missy, Piano Fingers*

I don't listened to Big Finish either, but at least others have that option.

If Amy can wait, so can I.:)