I didn't see any threads about this so I'm starting one. Here is the link for the type of extras they're looking for. 'Transformers 3' Chicago and Los Angeles extras and principal casting information! and this is the agency that's filling those spots.. Joan Philo Casting A few of my buddies made it in when they filmed Dark Knight and pretty much just stood around as extra's while they filmed Chicago. Good luck to anyone that gives this a shot!