These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Macross Zero
Epileptic Trees (What the heck was the Bird Human anyway, and what did it actually have to do with the rest of the series?)
Clues are scattered throughout the franchise; the Bird Human's mysterious symbol shows up in DYRL, Macross Frontier ep 22, and amazingly, during the All-That-VF airshow (MF version) over the same desert mountains near New Edwards Air Force Base from Macross Plus. Oh, and one of the relics in Zero shows up in Brera's last scene in Macross Frontier