1) I was wondering why it was there too. Did you copy/paste this or did you transcribe it from some audio source?
2) Not always. There are three ways to do it: a) use the -te form for all adjectives except the last one, b) use the plain adjectival form for all adjectives, and c) use the adverbial form for all adjectives except the last one. However, you have actual adverbs here.