The protagonists claim that the fictional "Gigon Lignage" grape variety is the only red grape in the World able to produce both white and red wines. This is wrong. Any red grape can be used to create white, rose, or red wines, depending on skin-juice contact (and the duration of said contact).
The two famous red wines (Chateau Cheval Blanc and Vega Sicilia Unico) discussed in season 1 come from two different countries and are two completely different red wines. They also feature different grape varieties, the Vega Sicilia Unico includes a lot of Tempranillo. It is claimed in the series that both red wines are made from the same grape varieties.
Blind tasting and then defining a wine and its vintage with high success rates can take many years of training. It is next to impossible to obtain this success level within a few weeks or months of training. Many candidates fail the most difficult wine exams in the wine world (namely "Master Sommelier" and "Master of Wine") in the blind-tasting sections at their first attempt(s), even after years of extensive training. Camille Léger 's learning progress looks impossible in the real world.
One "rare" (according to the series) grape variety in France (Gigon Lignage) is completely fictional. All the other grape varieties discussed in season 1 do exist in reality to make wine.
The two famous red wines (Chateau Cheval Blanc and Vega Sicilia Unico) discussed in season 1 come from two different countries and are two completely different red wines. They also feature different grape varieties, the Vega Sicilia Unico includes a lot of Tempranillo, for example. It is claimed in the series that both red wines are made from the same grape varieties. This is wrong.