7. Working too hard
Believe it or not, burning the midnight oil can backfire. Research shows over-working can decrease performance, because it deprives you of sleep. Most bosses don't care how long you work -- just how much you get done.
"Working 24/7, where you're always accessible, where you just kind of seem harried because there's always so much to do -- you're not seen as someone who manages their time well," Frankel said.
With so many rules, how can you be comfortable being yourself and doing your job?
Paradoxically, that's the whole point of knowing the hidden rules, Shapiro said.
"It's easier to be yourself if you know where the land mines are," she said. "It's actually very empowering, and you can make really good choices."