Back in the old days, there was more time spent immersing an audience in the movie world before the primary action began, now audiences are used to immediate and unrelenting action from start to finish.

When movies were filmed with technicolor cameras, they had an entirely different look and feel than movies today. This is because of the increased lighting, the different choices with regards to costume and staging, as well as the technicolor technology itself, which made for a bright, highly contrasting picture compared with the more muted hues of today's movies.

Special effects back then often warranted scenes being built around them, whereas today cgi is placed into the frame wherever it is deemed necessary.

And of course, in 77 a portal opened in space-time which allowed untold magic to escape into our realm, resulting in Star Wars, The Thing, Blade Runner, ET, The Dark Crystal, Alien, Back to the Future, The Princess Bride, and many other movies which were obviously Truth given Form, before the portal was closed in the late eighties.