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Then there’s stuff which clearly makes no difference to the taste even though people say it does — like the shape of the wine glass.
There are interesting cases like price and how the label looks, which obviously don’t affect the taste but do affect people’s perceptions of the taste — the point of blind tasting is to remove some of these biases.
Age is interesting since it obviously makes a difference, but you can’t do a side by side tasting which holds vintage constant and varies age. Experts can tell the difference between old and young wine but maybe within a threshold of 5-10 years (less for a young wine)
I found it interesting at vineyards how the grapes that grow right next to the ones used for grand cru have different production methods. Because with restrictions on what it's named they wouldn't be able to charge nearly as much for it.
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