One of my big "wait, what?" moments was - after learning about the biological process that caused aging in humans (telomerase reduction in cell subdivision) - also learning that that exact same process caused aging in virtually every other living organism on the planet...
...not some "flaw in the mold" unique to humans that kept repeating itself, generation after generation (this was explicitly mentioned in the Memorial talk this year, BTW, so I assume it's still the WTS's official company line)...
...and that it was impossible for the entire animal kingdom to be "guilty of Adamic Sin", so WTF???