The gun Fragancia stole is a Mauser semi-automatic, yet commissioner Samnerud and Fragrancia both refer to it as a revolver. Those are two very different types of handguns, and as a policeman Samnerud should know the difference.
Fernandez says that Glenn Seaborg managed to produce gold out of lead. This is incorrect. Seaborg actually managed to transform a minute amount of the element bismuth to gold. But Seaborg used nuclear physics for his experiments, not chemistry which is Fernandez' preferred method.
Most anachronisms in the film are deliberate, as the filmmakers intended a timeless setting.