In 1985, GM introduced a brake system called Powermaster, which replaced the traditional vacuum booster with a system consisting of an electric motor, a gas-charged pressure accumulator and an electronic pressure switch. It was used on the Buick Grand National and some full-size station wagons. The system was an epic disaster that resulted in several recalls, and most owners chose to remove it and install a standard vacuum booster (which fortunately was possible with some modifications). The most interesting part is that the Toyota Prius uses almost the exact same design (except the Toyota version actually works!) because there's no source of vacuum when the gas engine isn't running.
The Ford F-150 with heavy-duty payload package is one of the only vehicles ever to offer a 7-lug wheel bolt pattern.
Chrysler offered an electronic fuel injection system in 1958! It didn't work well and few were produced, but it was an orderable option sold to the public. One car with the system has been fully restored to working condition. More here:
http://www.allpar.com/cars/desoto/electrojector.html
The 1970s GMC factory-built motorhomes are FWD and mechanically related to the Cadillac Eldorado.
Our first-gen Scion xB was sold in Japan as the Toyota bB. However, our second-gen xB is a JDM model called the Corolla Rumion. There is a second-gen Toyota bB in Japan that was never sold here.
The car we knew as the 1988-93 Pontiac LeMans is still built and sold in Uzbekistan as the Daewoo Nexia.
The AMC Pacer was originally supposed to have a rotary engine that would be developed as a joint venture between AMC and GM. When the first energy crisis hit, GM gave up on the idea and left AMC hanging, without enough funding to complete the project. This is why the AMC I-6 barely fits in the engine bay of the Pacer -- it wasn't originally designed to be there.
-Andrew L