Hagrid red flag

[dfrankis at dial.pipex.com]

No: HPFGUIDX 19496

The recent posts about Hagrid's social life and eating habits before 
COS reminded me of one thing that has been bugging me.  In PS/SS, he 
is introduced (in a chapter title, no less) as the Keeper of the 
Keys.  What does this mean?  Is it, for example, his job to keep the 
anti-apparition barrier in good nick?  Or are there some important 
doors we haven't seen yet at Hogwarts?

any thoughts?

On red flags generally, quite a few of the things that later turned 
out to be significant (parseltoungue, Sirius, the protective role of 
the Dursleys) are right near the beginning of the series.  Any others?

David