Freestyle Video below(courtesy of Total Immersion and YouTube)
Skip to the swimming at 0:45 if you'd like.
Underwater: Notice the swimmer's elbow and hand position- high elbow, fingertips pointing down. Also notice that he is constantly letting air trickle out his nose. His head is perfectly still, looking down except for some very sneaky breathing.
Above water: Notice the high elbows and smooth entry, finger tips first- there is practically no splash! Again, his head is perfectly still, looking down except for some very sneaky breathing.
Backstroke Video below(courtesy of Ryan Lochte and YouTube)
Above water: Notice Ryan's straight, relaxed arms as he recovers. Also his hand enters just outside his shoulder pinkie first. His legs and feet never stop moving- even rhythm, toes pointed. His head is perfectly still with his chin pointing towards the ceiling.
Underwater: Notice the S-pull! After the hand goes down, he bends his elbow and his fingertips are pointing to the side of the pool. Take a look at where he finishes- DOWN PAST HIS HIPS! As he is finishing past his hip, he is also rotating to his other side.