- As a director, he said he liked to think of the movie screen as a traditional proscenium-arch stage into which people and objects could abruptly enter as if coming in from the wings. He often used this technique for shock effect, as in It Came from Outer Space (1953) when Russell Johnson's hand suddenly reaches in from the side of the screen to touch a startled Barbara Rush on the shoulder.
- He was the director of The Sid Caesar, Imogene Coca, Carl Reiner, Howard Morris Special (1967) special on CBS; it won an Emmy for outstanding variety special of 1967.
- He has directed one film that has been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: The Incredible Shrinking Man (1957).
- Some time after The Lost World (1960) came out, Universal Pictures planned to remake the Arthur Conan Doyle classic in the U. K. with Arnold directing. It was a project he wanted badly to do, but according to friend and former star John Agar, the studio canceled the project because of Arnold's health issues.
- Father of two daughters: Susan Arnold Jacobson (casting director Susan Arnold) and Kathy Arnold.
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