While portraying the dreaded O'Hara, an urban legend surrounding the making of Enter The Dragon claims that he never quite got along with Bruce Lee and that the fight on the parade ground where he smashed the bottles was more than just a managed fight. However, Wall and others present at the time deny this story, stating the tale was blown out of proportion and that Wall and Lee were actually good friends. Wall has studied several arts under many notable masters. They include Judo under "Judo" Gene LeBell, Okinawan Shorin-Ryu under Joe Lewis, and Brazilian Jiu-Jitsu under the Machado Brothers.
Wall is a 9th degree black belt under Chuck Norris and the co-founder and CEO of a martial arts organization known as World Black Belt Inc. In 1975 Wall authored the book, "Who's Who in the Martial Arts and Directory of Black Belts" Library of Congress Catalog Card No. 75-2280, the first book of its kind for martial artists. Wall has been married to his wife Lillian for 40 years and has two adult daughters: Shana and Kara.