Forgot to mentain that in Ep 16 "Doomworld" there are two cameos the first one I think some people might like because of what happens and keep a eye out for the intro.
All I'll say about some of the finale is Back To The Future Part 2.
Preview pics from Ep 17 "Aruba" Season 2 finale
Ep 17 "Aruba" Season 2 Finale
Really enjoyed the finale, I liked how they did the intro which little different. The Ep was little dark and gory in places which i won't spoil. There also was a cameo from a character in CW DC universe again won't spoil who but it was really touching. There were also a few WTF the moments especially in the later half the Ep let's just say it's gonna interesting in how certain events will effect The Flash in the future seasons. The Ep felt like the third act of Back To The Future Part 2 in a good way you'll see what I mean by that film reference when you watch it. My only grip was with the certain romantic relationship which you know can't happen because of certain events and for me wasn't dealt with right unless they do in the next season. As for the ending because of certain events and a certain rule that they can never break sets up season 3.
Marc Guggenheim has said the team line up will change in season 3 so they haven't said who will be bought in and who will go all tho one character has gone.