I agree 100% What also bugs me is the inevitable small amounts of chrome flash that exists on most chrome wheel rims (at the mold parting line) and aren't sanded off or dealt with in some manner. I also cringe when I see badly applied chrome BMF; no foil is better than bad foil, at least as I see things. (I tend to avoid models that require a lot, as I really suck at it, whereas someone like Steve G has apparently totally mastered it.) Monster truck tire treads on street car tires also annoy me, and are present in so many kits, it seems. Glossy tire treads are another annoyance.
My own issues with my models are inconsistencies with "tooling upgrades". The AMT '32 Ford Victoria pops to mind; modern fancy new engine coupled with driveshaft, rear end and suspension system originally designed for a 90 year old car. As an aircraft and armor modeler, I guess I'm just spoiled by choice, as new kits flow like a river, whereas with what I see as the more desirable car models, I'm generally stuck with 60 year old kits that most certainly reflect their antiquity.