I ran into a glitch on lesson 19 that would not register my input properly. It was fine... i just advanced to lesson 20 manually, but might want to take a look there.
Also, I found myself typing "db.unicorns.find()" a few times in order to remember the schema. It would be easier if this data persisted in the scrolling history or something so I didn't have to reexecute this command a few times.
Great job though, I did the 15 min tutorial and felt like I had good control of the basic CRUD syntax by the end of it.