Hello! I'll try to answer this as best as I can!
1. Originally, to get the 2 common endings you had to choose "go with the heroic pixies" then you'll get 2 choices near the end "trust the pixies" or "don't trust the pixies" and those 2 would lead to 2 different endings, however one ending was removed due to the itch purge, one year ago.
2. To get another TBC screen, you have 2 choices for that. "To go alone" or "to confront the nameless pixie" each one will get you a TBC screen but there is a little difference in the dialogue.
Hope this made things clearer and helped!!