In answer to dysonswift: Alienskin makes a terrific set of Photoshop filters called Exposure that mimic many of the old film stocks. Right now that's the best way to get some of the colors of these old images. And you are right -- many such images were airbrushed or even dye-retouched directly on the transparencies. I once worked with an old photo-re-toucher and what he could do to a transparency with a brush and some colored dyes was amazing. A lost art, for sure. But check out the Alienskin arsenal and I think you'll find some pretty cool tools for achieving photo-realistic looks.

The Mexican coca cola is made the old way with sugar not fructose. I think they and alot of others soft drink manufactures switched to fructose as a cost saver. There may have been a tariff for imported cane sugar that pushed them to fructose. I have notices that a lot of small soft drink manufacturers are using cane sugar. I have been able to get the coca cola from Mexico at costco! and not have to go to Tecate. Thanks for your retros.
Adios
Marshall