Several times throughout the movie , whenever Gamera or Zigra are in the foreground and the spaceship or something is in the background , you can very plainly see that it is clearly a painting or a prop because some of the back drops have lines all over it and you can also clearly tell that it is fake .
Even though Gamera is a monster , how is it possible for him to not only use his flame jets underwater , but his fire breath as well .