Other mistake: Obviously, the spider needed a crew inside to manage its operation (feeding the boiler pressure going to keep it moving), but after West dispatches them individually, the spider seems to be able to run on its own when West and Gordon head back to Washington at the end of the film.
lionhead
2nd Apr 2019
Wild Wild West (1999)
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Suggested correction: There are still crew operating the spider, you just can't see them. Also, it's possible the thing is mostly automated, might need only 2 or 3 people in total.