Does a 747 actually have a drop ceiling?

Organization: George Mason University, Fairfax, Virginia, USA
Date:         10 Apr 96 02:17:43 
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I was unfortunate enough to see the movie 'executive decision' last week
with a friend.  It was a movie worthy of a mystery science theatre
review.  But it brings up a few questions:

Does a 747 really have a drop ceiling above the passenger cabin?  Is this
mostly open space like the movie suggests?  I personally don't belive it
is, but wanted to ask someone who might actually know this.  I appriciate
your help.