데 means 'place' or 'case', and every line here uses it in the phrase 같은 데 보면 — 'if you look at somewhere/something like ~'. It is how a speaker introduces a familiar source before making a generalisation: 동화 같은 데 보면 공주들 되게 많잖아요 (in fairy tales and such, there are loads of princesses). One line uses it literally, of a spot on the body (인중 같은 데 보고 해요, look at the area under his nose), which is the underlying 'place' sense.