The producers of this popcorn fare didn't know much about wine. Throughout this wine-guy-as-dork/snob stereotype film, the main character "Miles" repeatedly insults both Merlot and Cab Franc. He calls Cab Franc "hollow, flabby" and "pointless" and he devotes and entire 5 minute tirade railing against Merlot.
So, what is the denouement wine he's drinking at the end of the film? CHATEAU CHEVAL BLANC!!! It's over 90% Merlot/Cab Franc, and obviously the producers were not aware of that. I'm only pointing out one item, but there are a number of inconsistencies and fallacies relevant to wine throughout the movie. What gets me is that it has become so much of a reference point for wine knowledge among the general population; why? It just doesn't make any sense.
Here is a story about Cheval Blanc you may not have heard:
The manager of Château Cheval Blanc, Jacques Hebrard, was outraged at the evaluation of his 1981 vintage barrel samples made by influential wine critic Robert M. Parker, Jr. and asked him to re-taste. Upon arriving, Parker was attacked by Hebrard's dog as the manager stood idly by and watched. When Parker asked for a bandage to stop the bleeding from his leg, Parker says Hebrard instead gave him a copy of the offending newsletter. Hebrard denies that Parker was bleeding. However, Parker did retaste the wine and found it significantly changed from his previous evaluation, and therefore gave the wine an updated evaluation in a later issue of his publication The Wine Advocate.
The writers/producers knew exactly what Cheval Blanc was. It was a punch line at the end of the movie.
Initially it was Petrus, but they turned it down as they didn't like the story. Cheval was the second option.