If you haven't tried your hand (brain? memory? open book?) at the Warbler Quiz, go to the preceding post. Don't ruin your fun.
Okay, here are some possible answers. Let me know if you disagree or have others.
1. Warblers without that word: Ovenbird, Northern/Louisiana Waterthrush, American Redstart, Common Yellowthroat, Yellow-breasted Chat, Northern Parula.
2. Adult males changing completely in plumage between Spring and Fall: Magnolia, Chestnut-sided, Blackpoll, Bay-breasted. Most "confusing Fall warblers" are juvenile females.
3. False -- warbler migration starts in mid- to late July, and peaks in September.
4. False! but note the much-later start-time for Friday September 3rd...