Keep Circulating the Tapes: Quite unlike Silver Star, Eternal Blue hasn't gotten nearly as much love in terms of re-releases or remakes (with the last full physical release and print run of the game happening in 1999-2000), and as a result, physical copies have appreciated in price substantially - the Sega CD version in particular is one of the most sought-after SCD collectibles, period. And of course, no (legal) digital version is available.
No Export for You: The Sega Saturn version of the remake, because of the fact that the Saturn had failed and virtually lost all market share in the States by the time both it and the PlayStation version were released in Japan. (There being bad blood between Vic Ireland of WD and Sega management by that point didn't help matters.)
The Working Designs translation for the Sega CD includes a line for "Killing Barney made easy" as a small Take That!. Barney was a hugePeriphery Hatedom target in the 1980s and 1990s, but quickly faded into nigh-irrelevance in the new millenium. This really makes the joke, and script, seem dated.
And then there's the kid who wants to see Mortal Kombat-style violence. And the infamous Clinton joke.