My favorite is something I read some 15 years ago or so, although I don't remember really where, that early CDs had terrible sound because people early on failed to realize the big difference between vinyl records and CDs. Namely that records are read outside in and CDs inside out, and this somehow required adjustments that made everything better, although I again don't remember how it was "fixed" :-).

Anyway, I don't know much about this stuff, but the biggest problem is always lack of education, not that people are stupid. There's a lot to know and people usually don't and can't know everything. I'd say in certain cases intelligent people are more problematic because they're capable of constructing a plausible explanation that makes sense only because they lack the complete picture.