Interesting forum I participate in:
http://www.bautforum.com/archive/index.php?t-33.html
So I have to back off a bit. A billiard ball has surface irregularities amounting to 0.2% and the earth, 0.3%.
The urban legend dies, sort of.
Now, back to whether the earth could have been covered with water, absent a miracle that erased all evidence.