Doogie knows Japanese, which he learned from the gardener.
At the age of four, Doogie's Mother realized he was able to learn languages very quickly when she took him to her Spanish class and by the end of the first week, he was helping her with her homework.
We discover Doogie had cancer and that Vinnie shaved his own hair when Doogie's fell out.
Doogie's Journal Entry: November 7, 1989... I know that I'm supposed to be the smart one, but when it comes to the art of friendship, Vinnie's a genius.
The German episode title is "Vinnie, Video, Vici".
This episode title refers to a famous quote from Julius Caesar regarding his conquest of Asia Minor "Veni, Vidi, Vici"
I came, I saw, I conquered.