The Danza: An early episode featured TV talk show host/supermodel/superhero Vendela, voiced by Norweigan-Swedish model and actress Vendela Kirsebom. Like the other examples of Celebrity Star, this doubles a highly(?) fictionalized version of As Himself.
Keep Circulating the Tapes: Only the first season ever got an official DVD release along with a few other episodes pieced on some of Cartoon Network's holiday DVDs, though the entire series is available on iTunes, 2 episodes from Season 1 and 2 were on 2 of the compilations on the short-lived Game Boy Advance Video and the first season has become available on Netflix.
No Export for You: The TV movie "Johnny Goes to Bollywood" never aired in the U.S, but it did air in Europe and Asia.
Talking to Himself: The Danish, dub played this straight in the Scooby-Doo Cross Over. Lars Thiesgaard, who regularly voices Scooby and Johnny, voiced both in that episode.