"SB-129" is the only episode where the title is read out loud.
In "SB-129", it is revealed that the Krusty Krab is closed on Sundays.
This SpongeBob SquarePants episode premiered on New Year's Eve, 1999.
The credits for "SB-129" are on a space instead of the the traditional underwater background.
In "Karate Choppers", SpongeBob and Sandy both use different pronunciations of the word "karate". Sandy pronounces karate as "kuh-rah-dee", which is the more commonly used and incorrect pronunciation of the word. SpongeBob, however, pronounces "karate" as "kah-rah-tay", which is the correct pronunciation of the the word.