The panel truck and the cargo van drive up the same street twice.
At the end, Tyne Daly's character is nowhere to be seen. There's no explanation for her disappearance.
Working under the hood of the 'getaway' car, Phelps is shown working on an engine with 2 four barrel carburetors on a cross ram intake manifold. No such engine configuration was available on a1971 full size Chevrolet.
The wanted posters of Wendell Hoyes and Cayman Hoyes are identical (except the names and mugshots). The Lee Collins' poster is also based on the same (note the "maid" occupation!).