IRON MAN hits DVD and Blu-ray on September 30th and one of the features you’ll surely see is a lot of the previz footage that Jon Favreau and his FX team put together for the many spiffy shots in the film. But before the DVD we have a pretty cool look at the previz that went into the IRON MAN trailer that generated so much buzz. Pixel Liberation Front, a visual FX studio that worked on the film, has posted a previs-to-finished-effect comparison that shows exactly how much work was done. It’s a pretty cool look at all the thought that went into everything you saw. Check it out below and thanks to Film School Rejects for the heads up!