There are far more period reproduction sources today than in 1992 and almost none in 1955. I replaced my light switches at home with these. They predate the house by a few years but have the right feel.
http://www.classicaccents.net/
Now you see why I'm cursed! Everything (usually my own stuff) has something "wrong" with it as you really cannot expect to be that meticulous. The things that bother me most are not the lack of budget, but when something could have been done well for the same money if only the research or effort had been expended. Herb Ryman once said "Bad Taste costs no more". He was right. We make it too easy to pick the same font and drag and drop a graphic without kerning the letters, or look at another theme park to research "history". It's all been done and better, but we fall into habits, myself included.
DLP had to be authentic, job one, so here's another source for a unique material we used extensively on Main Street as an alternative to wallpaper. It's not plastic, it's Lincrusta. We scenically painted it to great effect all over the area and it felt true to the time.
http://lincrusta.com/TheHistoryofLincrusta.Asp
http://lincrusta.com/TheLincrustaCollection_Product.Asp?CollectionName=Wallcoverings
Ceilings were authentic as well. There are better sources, but you want historic patterns and real trims, not the kind that fit into T Bar drop ceiling systems.
http://www.thetinman.com/styles_turncentury.htm
Then the props have to be spot on, and here's the place we bought DLP hearths and furnishings from for Walt's. Especially the lobby.
http://www.antiquariantraders.com/c-13-architectural.aspx
We hired this company to build the Elevator and Nouveau Hearth at Walt's and produce most of the stained glass windows.
http://www.andythornton.com/en-UK/portfolio/15-themed-venues