I think we have become more visual. The concept of season changing in first version is portrayed by using flower petals to symbolize spring or snow to symbolize winter.
In the second version however, the use of visual is used to explain the season change. For example, we see the spider creating its web or flowers growing. Moreover, in the older version, we don't get to see the time machine itself, while in the newer version, the time machine will have to be portrayed.
F
Images are sharper. In the original version, the movie was shot in a studio, while the newer version, the images were created by computer.
I think we are becoming more demanding as a viewer. While it was sufficient to leave the idea of the fourth space as explanation in the older version, we now demand that we will have to see the images to believe/comprehend it.
I am not sure whether our understanding of time has evolved, but we certainly have different ways to portray time. As the older version of the file points out, we are still trapped in the present.
Science fiction extends our understanding of the world. As a child, I grew up watching Doraemon, a Japanese science fiction manga. The concepts that are "played" with in the manga have materialized today. Without imagination, I don't think we can extend our current understanding/knowledge.