Continuity mistake: Shichiroji throws a spear out the door of Rikichi's hut in anger, it lands obviously in parallel with the door. Later, after Kikuchiyo's outburst he runs outside and picks the spear up, however it's now laying sideways compared to the door.
Seven Samurai (1954)
1 continuity mistake
Directed by: Akira Kurosawa
Starring: Toshiro Mifune, Takashi Shimura, Keiko Tsushima, Yukiko Shimazaki
Factual error: Toshiro Mifune's character, Kikuchiyo, travels to the bandits' camp and steals one of their two remaining fuselock muskets. Shortly afterward, the bandits fire twice at the samurai within five seconds with their last firearm. A fuselock takes as much as two minutes to reload, prime, and fire.
Kikuchiyo: This baby... It's me... It's what happened to me.
Trivia: Seiji Miyaguchi, who plays Kyuzo the master swordsman, actually had the least experience with swordplay among all of the actors who play samurai in the film. In fact, he never even touched a sword until a few weeks before shooting the film (he initially turned the role down for this reason). Most of his fight scenes rely on clever editing to make him appear to be a master.