This article is from the The Simpsons FAQ, by Ondre Lombard wakkojr@nospam.wcat.com and Andrew Gill superluser@mail.rit.edu with numerous contributions by others.
Watch the closing credits to each episode. The credit page with the
copyright information (usually the fifth page from the end) contains the
line "THE SIMPSONS EPISODE #____" which is the p-code for that episode,
with the exception of 7G08 where the p-code immediately follows the
copyright notification. The p-codes for the music videos are found on
the broadcast tapes' slates (special title cards for TV station personnel).
 
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