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Check out The Big List of Movie Mistakes. I enjoyed browsing the Top 25 page.

I think I am going to have to print some of these lists out and sit down to do some serious movie watching -- especially the Back to the Future series. I have to admit, I'm surprised there aren't more errors in that series, given the inherent problems in trying to keep three movies consistent across three different viewpoints. (Personally, I thought they did a *fantastic* job!)
The other interesting thing I came across at this site is the relatively new problem of combining digital effects in movies (not perfect) with the ability to view individual frames on DVD, as evidenced by some of the comments for Jurassic Park. (Similarly, anyone remember the hysteria over Jessica Rabbit's underwear?)