My girlfriend got the Illusionist and The Prestige mixed up. At the time, I hadn't heard of either of them, so she told me the plot line of The Prestige thinking it was the Illusionist. So, we go to the theater to see the Illusionist and as we are watching the previews, they show the trailer for The Prestige. I was one confused mother fricker...... She leans over and says, "I think I got the movies mixed up, I'm not sure what this one is going to be about".
Nevertheless, I enjoyed The Illusionist and eventually watched The Prestige, enjoyed it as well.