Very true about the mechanical bits.
I think the one part I reworked loads of times on the final color piece was the wing-flapping gears. It drove me crazy trying to make sure it looked like they could rotate in a way that might VAGUELY give him lift (it still probably wouldn't, but better it make it look like he can hap-haphazardly flap than not flap at all!).
And yeah, I hear you on the comments... I am still trying to work through the bulk of them from 2005 onward and the amount of time it's taking is ridiculous. >_<