After an intensive talent search, Lynda Carter, who had had a handful of minor acting roles and had been the 1972 Miss World USA and a Bob Hope USO cast member, was chosen for the lead role. For the role of Steve Trevor, the producers chose Lyle Waggoner, despite his dark brown, almost-black, hair not matching the comic's blond Trevor, who at the time was better known as a comedic actor after several years co-starring in The Carol Burnett Show. He was also known to Ross as having been one of the leading candidates to play Batman a decade earlier, but instead Adam West was signed. Waggoner was also considered a sex symbol, having done a semi-nude pictorial in the first issue of Playgirl.
Diana's uniform as Wonder Woman, designed by Queen Hippolyta, features emblems of America, the land to which she will be returning Steve Trevor. A golden belt will be the source of her strength and power while away from Paradise Island. She has her bullet-deflecting bracelets and also receives a golden lasso which is unbreakable and forces people to obey and tell the truth when bound with it. As shown later in flashback, Hippolyta also teaches Diana how to transform her clothes magically into the uniform.
Filming occurred outside the U.S. Capitol in Washington D.C. during mid-June. Other filming locations around DC included the Penn Quarter neighborhood, McPherson Square, the DAR Constitution Hall near the White House, the Museum of Natural History (Smithsonian), and the Lincoln Memorial. By mid-July, production in the United States was completed and moved to England. In August, filming on location took place in several places around London, including St. Andrew's Place, Regent's Park and the Royal College of Physicians. Between September and October 2018, production also took place at Almería, in Andalusia, southern Spain, as well as Fuerteventura and Tenerife in the Canary Islands.