Yeah it's best not to think too hard about how the stuff could've been accomplished because the movie took real illusions of the day and presented them in an impossible way. The best way to appreciate this movie is to accept what you are seeing can't be duplicated in a real world situation and just enjoy it.
A good example of this is the orange tree illusion. The orange tree is a real illusion but it involves only the oranges "sprouting" from the buds and not the entire tree growing. It also has two very mechanical butterflies that are much less spectacular than what's seen in the movie. Here's a presentation of the actual orange tree illusion:
https://www.youtube.com/watch?v=SZb4nw7_hGY
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