If you know much of anything about Any Particular Subject, you will notice that the movies almost always get it wrong ![rolleyes ;/](http://www.armedpolitesociety.com/Smileys/default/rolleyes.gif)
Yep pretty much. For example most musicians cringe whenever they see people "playing" musical instruments on screen. Also, most "conductors" on screen are pretty laughable too.
I think the problem is that to get things completely authentic you need a technical advisor at every single step of the production process. It may not add much to the cost of a movie to have a couple more consultants, but it costs a lot of money having a know-it-all step in to correct things every step of the way. This could really slow down a very tight schedule. And when costs are in the thousands of dollars an hour range, details necessarily get overlooked.
Whenever I go to see a movie I try to turn off my inner Cliff Clavin and just let my suspension of disbelief take over.