The King of Atlantis tells Spongebob his name is "Lord Royal Highness, but his friends call him LRH." This is most likely a subtle dig at or nod to Scientology founder L. Ron Hubbard, who is referred to as LRH by many Scientologist.
This is the last SpongeBob SquarePants game to be released on the Game Boy Advance and PlayStation 2 (Not counting the GBA version of Nicktoons: Attack of The Toybots (2007), or the PS2 version of SpongeBob SquarePants featuring Nicktoons: Globs of Doom (2008)). It was also one of the last games to be released on the GBA.