When characters are introduced for the first time their names get capped, I believe this is to draw attention to them so the producer/casting director can more easily estimate number of actors required, or somesuch logic.
Why random words are sometimes capped is one of the universe's great mysteries but I believe it has to do with either drawing the reader's attention to something important, and/or subtly suggesting a camera shot, e.g. and just for fun's sake,
Fred opens the drawer. Inside, a bloody KNIFE. Fred GASPS in surprise.
...Spec screenwriters aren't supposed to use camera directions, that's the director's domain, but in the above example capping KNIFE suggests the camera ought to zoom on the drawer to see the knife and the blood, while GASPS suggests a close shot of Fred's surprised expression. That's my theory anyway.
In the Pulp Fiction script, by capping BARRELS methinks the writer may have intended a shot of the Chevy Nova zooming down the road, kicking up dust. Again, that's my theory. When you're Tarantino you can write your script any way you damn well please!
In the good old days before PCs, screenwriters used typewriters and manually set their tabs to conform to industry standard. I've heard tell that they learned that standard by buying copies of screenplays and measuring spacing with a wooden ruler.
Nowadays software is available that does all the hard work for you. You can download trial versions for the following industry standard products, each of which will go some way to teaching you correct format as you write. (Some function may be limited, e.g. you can only save 15 or so pages, printed pages will have a TRIAL VERSION watermark, etc.)
Movie Magic
Final Draft
Sophocles
...You might also take time to read their onboard help panels and tutorials.
I haven't tried it myself yet, but recently a couple of folks have said good things about this software:
Celtx
If you're a Microsoft Word user, screenwriting templates are available here:
http://www.bbc.co.uk/writersroom/scriptsmart/
Some other miscellaneous screenwriting info, if you don't already know:
Check out
Absolute Write's own screenwriting page.
If you don't already, visit screenwriter Bill Martell's
Script Secrets site every day to soak up Bill's screenwriting tips. Take a look at the various links to classes, seminars, CDs, blue books, etc. Bill has also made many of his produced scripts available for educational purposes.
Site link removed per request of other site's Webmaster
Visit the following sites to download free-for-educational-purposes screenplays. Pick your top 100 favorite movies, read the scripts and discover how the words translated to the images and dialogue you loved!
http://www.script-o-rama.com
http://www.simplyscripts.com
http://www.imsdb.com
The following how-to books have been recommended by various members (listed in no particular order of preference):
The Screenwriter's Bible by
David Trottier
Screenplay by
Syd Field
Story by
Jim McKee
Hope it helps! And welcome!
-Derek
Derek's Web Page - stories, screenplays, novels, insanity.