I did not expect to see anything in this episode until I noticed this!

How long do they do this together?

Canon TwiDash

I just noticed, that Twilight could probably increase the number of ponies visiting the library, if she would have some sofas (or at least some pillows), where you can comfortably sit down and read.
Rainbow must really love Twilight, if she chooses the stairs in the library over her own cloud-bed.