As the HAIR Bus drives across the bridge into Dallas circa 1971 the skyline is the modern 2000 of Dallas with several post 1971 buildings visible.
In the opening shot it shows the Minneapolis skyline with the Metrodome. It says it is 1978. Construction did not start until 1979 and opened in 1982.
1983 scene in Kitchen right before Meat Loaf walks in from touring Europe there is a 2000 era model microwave on the counter.
Scenes supposedly filmed in Dallas County, Texas feature prominent mountains. There are no mountains whatsoever in Dallas County, Texas.