I have had the automatic headlight warning come on twice in two months - don't know why. I bet it is tricked under cetain conditions - but only my theory.
I have also had variable power steering warning - I got this twice if I turn the engine off and straight back on again (don't ask me why I would want to do that).
Some say don't get too hung up on some of these warnings if they are infrequent and don't stick around - but it would be interesting to hear any opposing views to this
The water behind the drivers front wheel should be the air conditioning condensation drain - perfectly normal to expell water especially after a drive on a hot day - if you look underneath you should find a small rubber flap that lets the water out.