The episode features a "grudge match" where Luffy discovers Franky is a cyborg capable of breathing fire and shooting from his arms.
His mouth appears on his stomach , just above his belt, while his face only shows his beard. One Piece Episode 238
This glitch likely occurred during the production phase when syncing mouth movements to dialogue layers. Key Plot Features The episode features a "grudge match" where Luffy
If you are looking for the primary narrative features of the episode: just above his belt