But really, pretty much any invention that the O'Hara Foundation was 'showcasing' at the Exhibition.Awesome, but Impractical: The Aero Corps.Their primary designer even says (in 1866) 'Shoot me and you'll set science back fifty years. Avoiding the Great War: Broadly invoked as the O'Hara Foundation tries to sell steam powered war machines to Europeans and other powers itching to try them out, with the real world consequences of applying progress to war looming over the whole affair.This has something to do with a mineral discovered in Iceland and dissolved in the water they're filled with.

Not only are three of them able to keep a giant castle floating in the air and provide almost unlimited quantities of steam at high pressure, they remain at room temperature the entire time. Also explains how the Great London Exhibition is now taking place in 1866 instead of 1851 (in a different part of the city), and how the Steam Castle can ram the Tower Bridge, which didn't even start construction for another 20 years in our universe.

Alternate History: Becomes pretty obvious early on when locomotives that can drive on roads at speed (no Locomotive Acts, perhaps?) and zeppelins and pre-dreadnought battleships show up in 1866 (at least a good few decades before they would have otherwise).

until the bombs carried by a crashed aerocorp trooper detonates inside the pavilion.

All Part of the Show: The battle between the O'Hara Foundation and the British government is seen as just a demonstration of new marvels by most of the crowd in attendance.

While it has aged fairly gracefully, it is still much more obvious than CG machines in modern anime.

2D Visuals, 3D Effects: The film relies heavily on digital animation for vehicles, matte paintings, and complex action sequences.

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