- Missing Episode: When American International Pictures bought the rights to redub and distribute it in the US, the Korean producers shipped all the original film stock and negatives to AIP, rather than copies. Now, the Korean version of the film is believed completely lost.
- What Could Have Been: The remake was originally going to use traditional suits for the kaiju but it was replaced with CGI. Stills of the suits can still be found, and most people agree they look much better than the CGI.
Trivia / Yongary: Monster from the Deep