Originally posted by: Scout trooper
Was the Greedo change an editing error or did George intentionally wanted him to shoot first in the '77 edition?

From the 1977 script:

"Han Solo slowly reaches for his gun under the table.

GREEDO
You can tell that to Jabba. He may
only take your ship.

HAN
Over my dead body.

GREEDO
That's the idea. I've been looking
forward to killing you for a long
time.

HAN
Yes, I'll bet you have.

Suddenly the slimy alien disappears in a blinding flash of
light. Han pulls his smoking gun from beneath the table as
the other patron look on in bemused amazement. Han gets up
and starts out of the cantina, flipping the bartender some
coins as he leaves.

HAN
Sorry about the mess."

Source: http://www.imsdb.com/scripts/Star-Wars-A-New-Hope.html