I second My Cousin Vinny. Really liked Joe Pesci's performance, and the judge's voice in the movie conveyed such gravitas. I've also heard that it's fairly accurate and is sometimes used as a teaching aid.
@runiggyrun pretty much covered it. When they say "challenges the accuracy of the evidence" it often looks like the author is attacking the premise. In the example above, Mary attacks John's statistics (i.e. 90% is NOT accurate).