- Though Godzilla vs. Gigan isn't the first movie to feature both monsters on the same side (they were previously both allies in Destroy All Monsters), this movie is where the friendship between Godzilla and Anguirus really shows, with the two working together to combat Gigan and King Ghidorah. And, in a strange way, it adds another layer if you consider the Anguirus in both Destroy All Monsters and Godzilla vs. Gigan to be the same one that Godzilla fought and supposedly "killed" in Godzilla Raids Again.
- In the Japanese version of "Godzilla Raids Again", it is explained that Angilas, "a peaceful carnivore", hates Godzilla because he's a violent war-mongering monster. Since by this point Godzilla is a straight-up superhero, Angilas would have no problem with him.
- The highlight for this has to be when Anguirus catches sight of Godzilla taking heavy fire from a high powered laser. One strong enough to knock the King of the Monsters off his feet and leave him in danger of serious injury or even death after repeated followup shots. Gigan and King Ghidorah stand 'guard', practically daring Anguirus to do something about it. "Challenge fucking accepted" seems to be running through Anguirus' mind, as he charges, utterly headless of any possible danger to himself, headlong at the tri-winged cyborg, getting a BUZZ SAW to the face for his efforts. Anguirus is heavily cut up, but keeps doing his level best to come to Godzilla's aid. Considering how the two started their acquaintance more than a decade earlier, it shows just how far the two have come. Godzilla returns the favor as best he can during the film as well, showing that the friendship is very much a two way street, and given that Anguirus has no real powers, it also goes to show how much Godzilla respects his spiky counterpart in this film, as the two are very much on the same page throughout the film, covering each other's backs as best they can the whole way through.
- Also during the initial confrontation after Godzilla and Anguirus arrive to face Gigan and King Ghidorah, at one point Gigan tries to attack Godzilla from behind but Anguiris runs between them, causing Gigan to only get a glancing blow on Godzilla and practically fall on top of Anguirus' spiky back. A minute later Anguirus uses his shell to shield Godzilla from King Ghidorah's rays as Godzilla uses him as support to get back on his feet.
Heartwarming / Godzilla vs. Gigan