The suits Dexter and Mandark were wearing may be a parody on the suits worn by the characters of the Tron movies.
The suit Dexter was wearing in this episode was the same suit he wore the episode "Game Over" when he tried to defeat Master Computer.
Title is a parody of Das Boot, a film about a German submarine (a U-Boat).
Although this episodes were aired on 2002, they were actually made in 2001 according to the credits.
Mr. Bunny Doodle was from the previous episode and he appeared in there again.