From US News&World Report:
Sometimes investors make retirement decisions that aren't in their best interest. Whenever you pass up a 401(k) match or pay high fees on your investments, you're ultimately hurting your own retirement security. Read more
The jury is still out on "irrational retirement decision #5": taking Social Security at 62. There are good arguments for taking it as soon as eligible and for deferring claiming as long as possible - and ideally until one reaches full retirement age. It's definitely a YMMV decision.