Fridge Brilliance: Scientists not believing Mafune's story of a dinosaur in Japan seems silly at first, considering how kaiju attacks are taken as everyday occurrences in the '70s films, until you remember that his initial discovery of Titanosaurus took place fifteen years prior. People would still often react with "A giant monster? Surely you're joking!" well into the 1960s, especially considering that fifteen years would've made it 1960 - Major events like Mothra and King Kong vs. Godzilla hadn't even happened yet.
That, and considering Japan had already suffered the wrath of two Godzillas, two Rodans, Anguirus, and Varan (plus two Mogueras and their accompanying alien invaders), perhaps the scientific community were Properly Paranoid, and were in denial about the possibility of such events happening again.
Moment of Awesome: Godzilla's first appearance as he arrives to challenge Titanosaurus: While Titanosaurus is destroying the city on front of it, a figure in dark is shown rising up nearby. Cue Titanosaurus getting a blast from a familiar atomic breath, knocking the thing flat on its back, followed by a Big G confronting the monster.
Narm Charm: The film's final shot - Godzilla's wave as he heads back to sea. Cheesy? Oh, yeah. But considering that it would be another 10 years until Toho made another Godzilla movie, it's a bit poignant.
True Art Is Angsty: The film has received alot of popularity with the darker and more serious Japanese version becoming available in the United States, but the film is still full of plot holes. Sure, it's a good movie, but being dark doesn't necessarily make it an underappreciated masterpiece.