Revealing mistake: When Anguirus makes his sacrificial charge against Gigan, the hand that is moving the Anguirus costume can be seen holding it.
Godzilla vs. Gigan (1972)
1 revealing mistake - chronological order
Directed by: Ishirô Honda, Jun Fukuda, Yoshimitsu Banno
Starring: Hiroshi Ishikawa, Minoru Takashima, Yuriko Hishimi
Revealing mistake: When Anguirus makes his sacrificial charge against Gigan, the hand that is moving the Anguirus costume can be seen holding it.
Kubota, Head of Children's Land: Look, the two space monsters. The one with three heads is King Ghidorah. And that's Gigan.