Wait for the end credits for examples of multitasking and nepotism.
CRAZY CREDITS:. "NO BATS OR RATHER LARGE AND ODDLY BAT-LIKE YET HUMANOID CREATURES WERE HARMED IN THE MAKING OF THIS FILM" (from the rolling end credits).
At about 1:07 the professor with the English accent is asked what they will need in the caves. His reply "Flashlights". An Englishman would say "Torches".
When Rosemary and Stanley are standing side by side in the caves, when she shouts her voice echoes. His shouts do not echo.
At 1:08:21 over Stan's right shoulder the wall of the cave has a rectangular patch. Straight lines and right angles do not exist in nature.