The Showa series contains examples of:
- Actor Allusion: The scene near the end of Gamera vs. Guiron with Kondo's glasses falling down his nose was a reference to a trademark pose the actor, Kon Omura, did in his comedy routines and ads. Since these all aired in Japan and he is very obscure outside of his home country, most people outside Japan just tend to see the scene as bizarre.
- Bad Export for You: Until recently with the release of the whole Showa series by Shout Factory, Most Region 1 Gamera DVD releases contain awful, faded, little to no color Fullscreen 16mm TV prints, most masters actually stolen from the video catalog Sinister Cinema. .
- Dueling Movies: The Godzilla series, of course.
- Dueling Dubs: About half the series was dubbed twice: First, by AIP-TV (The English Language Dubbers Association and Titan Productions did the actual dubbing) in the '60s and '70s, then later by Sandy Frank in the '80s, who used pre-existing Hong Kong produced dubs for at least Barugon and Gyaos. The first set of dubs are the ones that show up on budget DVD releases (the actual pristine film elements are currently stored in the MGM vaults); the second appeared on MST3K.
- Fan Nickname: "Kenny/Kendra/Kennys" for all the child characters who's actual names the audience don't bother to remember. In two cases they literally were named "Kenny" though.
- Keep Circulating the Tapes: Neptune Media's OOP tape of Gammera The Invincible is the only way the see the American theatrical version in widescreen. Shout! Factory intended to include this version on the Gamera DVD, but the UCLA, the owners of the print used for the Neptune tape, refused to offer it again for a new digital scan. Since Celebrity/Just For Kids never issued it on Laser Disc, the Hong Kong dub of Barugon, which was oddly not included on Shout! Factory's DVD, also shares this fate.
- Name's the Same: Barugon / Baragon from Toho's Frankenstein Conquers the World .
- Trope Namer: Gamera is this for Friend to All Children
- What Could Have Been: An unfilmed movie by the name of Gamera vs. Garasharp. Garasharp was a massive, cobra-like creature, armed with a sonic rattle and poisonous breath. The story ends with Gamera defeating Garasharp (naturally) and two babies emerging from her body. Just as the military closes in to destroy them, Gamera rescues them and flies them off to a deserted island, because he's the friend to all children, not just human ones. The film was scheduled for a 1972 release, but Daiei went bankrupt before they could start on it.
Examples from the rest of the series:
- Development Hell: Aside from an announcement, there has been no news of the 2015 Gamera movie
- What Could Have Been: An anime based on the franchise was planned (rumor was that Cartoon Network was going to sponsor it) but was scrapped after Gamera: The Brave tanked at the box office in Japan.
- Daiei had approached Toho with a proposal for a crossover film with Godzilla. Toho rejected the proposal.
- Yoshimitsu Banno, director of Godzilla vs. Hedorah, had planned a 40 minute 3D Imax movie in which Gamera dealt with his own pollution monster and would have teamed up with a monster based off of Journey To The West's Sun Wukong.
- Expy: The Heisei's incarnation may possibly (perhaps unintentionally) be one of Godzilla (1994) before it was screwed up. They both were created by ancient civilizations to fight a greater menace.