Ziggy Stardust said:

Taxi Driver.............Seeing all these ordinary people who obviously weren't extras walking down the street wearing these old clothes really give the film a really retro feel, and upon the first few minutes of initial viewing, you can tell what decade this was filmed in.

I don't nit-pick you guys too often, but if I may; Taxi Driver was filmed in 1975, released in 1976. It's not retro - it's original. The Indiana Jones films, Super 8, Catch Me If You Can, Apollo 13, etc - those have a retro feel.

[off-topic]
I work with a girl who always comments about how our house has a cool retro feel. Our house is a Mid-Century Modern, built in the late 1950s. While we have made some updates to the electrical, plumbing, appliances, doors, windows, tile, etc - we have been very careful to stay true to the style of the 50s and use specialty companies (fixtures and doors) or custom builders (cabinets and tile).

We do a great deal of research and Photoshopping before we add or replace something. Our house doesn't feel like a house from the 50s - it is a house from the 50s.
[/off-topic]