Important Grimm Lesson from this episode:

Grimms are born with a physical difference in their optic nerve that makes them able to see Wesen. 

It’s still unexplained how this abnormality works, since Grimms aren’t able to see Wesen their entire lives. It’s triggered somehow. But, it does explain why the eyes are how Wesen tell the difference between Grimms and non-Grimms.

I adore how naive they still sort of are like you just found out that Nick was deeply changed by a spell but when he has a physical episode, they bring him to the regular hospital.

Same thing goes for Renard. You were brought back from the dead using magic, why would you go to a human hospital? You’d expect Renard to know better.

You know where they should be? The Spice Shop.