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Defictionalization: Duck and Marvin became the mascots of the Mars rovers Opportunity and Spirit, respectively.
Hey, It's That Voice!
Michael Dorn is every Centurion. And, in a Casting Gag, all the Klunkins except Sa'am.
Kevin Smith is Hal Jordan! And Q is Sinestro! Sholy hit!
Not to mention John DiMaggio as Kilowogg, Tara Strong as Katma Tui and Grey DeLisle as Boodika.
Quentin Tarantino and Bruce Campbell have had guest appearances too (as an old kung-fu master and a super-buff version of EYSC, respectively).
Mako Iwamatsu is the voice of Dodgers' Happy Cat alarm clock. This was exploited when the clock became the Expy of Aku in "Samurai Quack".
Dr Maniac is Fonzie!
And of course, the Expository Theme Tune is sung by Tom Jones.
Kelly Ripa guests as an obsessed Stalker with a Crush.
Macy Gray plays the title character in "Diva Delivery".
Post Script Season: The "Of Course You Know This Means War and Peace" was written to wrap up the series if need be (hence, say, Dodgers learning to appreciate the Cadet), but more episodes were ordered.
Screwed by the Network: The last episodes of Season 3 didn't even air on Cartoon Network, as the series was abruptly pulled.