Bridge Jump Location
I think I found it...
http://www.google.com/local?f=q&hl=en&q=&t=k&ll=37.819743,-121.449893&spn=0.002148,0.005032
They jumped it going south to north.
I think I found "Dutton Flats" too...
http://www.google.com/local?f=q&hl=en&q=38.191935,-121.083884
In the movie you can barely make out the street sign there of "SIXTH" and "STATE HWY 88", and they drive across train tracks and turn into a long parking lot next to the highway where the flea market is.
-Jon