I hate to nitpick at Freaks and Geeks, a brilliant, short-lived (why do the two always seem to go together?) show about the travails of teenagers in 1980, but the lads we see above would do no less. Here we see zen master Harris Trinsky holding a copy of the Dungeon Master’s Guide. The DMG first appeared in 1979, with cover art by David C. Sutherland III.
The version in Trinsky’s paws, however, with cover art by Jeff Easley, came out in 1983.
That’s 3 years after the scene takes place. Unless, of course, Harris traveled into the future and back again, which is well within his powers.
Later in the same episode, right before Harris tells Daniel he’d be a good DM, we see the first edition Monster Manual (1977). This cover is also by Sutherland. The Easley cover edition came out in 1983.
2 Warps to Neptune 
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