Since two movies are being released about the famous Judgment of Paris (Bottle Shock, and another based on George Taber's Book) there's a resurgence of interest in the impact this event had as well as heated discussions about the incursions of the mainstream media and Hollywood into the serious, academic and purportedly independent world of wine. When Sideways came out same thing happened: much hullabaloo and prices for most Pinot Noirs went up.
The scientific validity of that competition in Paris is generally considered statistically irrelevant. Like most blind tastings and competitions there's too many factors involved to render any sort of accurate conclusions. The wiki article on the whole event sums this up nicely. But of course the public perception and the imagery of the tasting did matter. California wines were on par (some said better) with their French counterparts. This ushered in a whole new perspective among casual wine drinkers around the world and while the effects were probably as much negative as positive it was, and is of lasting importance.
For me, Bordeaux is as much a British wine as it is French (and these days it's a truly international affair) so I don't think that line-up even mattered in principle. The Chardonnay war was a little more interesting, but I think the effects of the '76 tasting on Chardonnay around the world was largely an unfortunate one. The question of American vs. European wine is of course interesting to me. I've already pontificated too much on it though, but you can check out an interesting little discussion I was involved in at the Wine Camp recently.
As far as the movies go I think they should be judged as movies, not wine history pieces. And all those that devote long posts and discussions to all the inaccuracies and wine fallacies in these movies should proudly take their place beside the Tolkien fans that did the same when those movies came out. That being said I'm a bit skeptical about a film that portrays a British man (Alan Rickman as Steven Spurrier) as being uncomfortable and tepid around fried food. And after aging for a few years I still give Sideways a solid 89pts.