To more accurately show how grueling it was for his character to survive, Vincent Price insisted on lifting real people into the back of his car instead of dummies. This is why it seems he's taking extra care with the bodies. For the scene at the pit, however, he's handling dummies for obvious reasons.
Established by many reviewers (including director George A. Romero himself) as a graphic blueprint for Night of the Living Dead (1968).
The strange, tall, UFO or mushroomed shaped building in the background behind Dr. Robert Morgan is the "Ristorante Il Fungo" in Rome, built in 1957. It was restored in 2013-14. It is also featured in L'Eclisse (1962).
Vincent Price admitted in later years, to having a fondness for the movie and rated it as superior to The Omega Man (1971).
The script was written in part by Richard Matheson, but he was dissatisfied with the result and he asked to be credited as "Logan Swanson".