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In the earlier era, there was much less coverage on TV and less film review by supervisors and crews. Films had to be developed, shipped etc. and multiple camera angles, etc. weren't available.
A lot of the changes are due just to how things look on TV and film. For example, squaring in requires an official to take an indirect route to the spot. It's done because it looks sharp on TV/film, but this change probably leads to poorer coverage.
Some changes, such as working wide are results of changes to the game - faster more athletic players, better fields, changes in the offensive philosphy.
Other changes are like out of bounds coverage may be due to prior problems that weren't noticed until more and better film review was available.
Overall, I think the tremendous increase in film review is the driving factor in most changes.
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