article_snippet: But the pictures instantly became a fascinating chronicle of the subtle lifestyle changes that Peter and Jane underwent in the years following Peter and Jane first appearance.
article_snippet: (right) Seatbelts have been added in the picture, right, but safety wasn't such a big issue in the earlier version .
article_snippet: You have to look carefully, but the dog is now on a lead in the later version on the right .
article_snippet: Subtle changes: In the 1960s (left)
highlights_snippet: Subtle changes were made to reflect lifestyle shifts one decade later .
  