Zigra in full shark mode resembles a Goblin shark, a rare species of deep sea shark found most commonly near Japan.

Gamera vs. Zigra was the only classic Gamera film not released in the U.S. until the advent of home video. All the previous films had been picked up for theatrical distribution or for television. Gamera vs. Zigra first appeared in the U.S. in 1987 via video tape, long after it's Japanese release.