When the son of Jeannie Epper, Lynda Carter's stunt double, told his classmates that his mother performed on the Wonder Woman television series, they didn't believe him, even after he showed them a photo of his mother in costume. When Carter heard about it, she invited his entire class to visit the Wonder Woman set to see Epper perform.
Lynda Carter had $25 left in her bank account when she got the call that she had landed the part of Wonder Woman. She beat 2000 other actresses to the part.
In the episode "Anschluss 77" (episode 2.2) the script called for Wonder Woman to grab on to a bar under a helicopter and hold on to it as the helicopter lifted 50 feet into the air. Actress Lynda Carter's stunt double shot the scene but as the camera was so close to the stand-in it became obvious that it wasn't Lynda. As the production crew was beginning to lose their lighting, Lynda felt she could perform the stunt on her own and told her stunt double to let her go instead. She filmed the scene herself, which angered the unaware producers of the series as Carter not only didn't inform anyone ahead of time, but did not use protective wrist guards that could have held her to the helicopter should she not have the strength to hold on.
Costume designer Donfeld had originally created a red, white and blue two-piece bikini for actress Lynda Carter when she was to perform as Wonder Woman in the water. When the finished bikini did not seem to stay on the actress during the required scenes, production opted to go with the full body wetsuit instead.
According to Lynda Carter, the three women who would become the original Charlie's Angels (1976) - Farrah Fawcett, Jaclyn Smith and Kate Jackson - all auditioned for the part of Diana Prince/Wonder Woman. Ironically, Lynda was also up for one of the Angels.