Richard Kiel (https://the-19.fandom.com/wiki/Richard_Kiel#:~:text=Richard%20Kiel%2C%20of%20James%20Bond,acted%20before%2C%20and%20Kiel%20had), best known for portraying Jaws in the James Bond series, was originally cast as the Hulk (https://www.metv.com/lists/7-incredible-things-you-didnt-know-about-the-incredible-hulk), and the pilot TV movie was originally shot with him, however, the producers decided that he wasn't "bulky" enough, so they fired him (http://www.thegeektwins.com/2014/09/q-why-was-james-bond-actor-richard-kiel.html) and reshot his scenes with Lou Ferrigno. A very brief shot of him remains in the pilot though, when the Hulk is about to save a young girl from drowning, the shot zooming out on him from the top of a tree is of Kiel, you can tell because of the lack of bulk and the fact that his face is of a different shape to Ferrigno's.

https://vignette.wikia.nocookie.net/the-19/images/5/55/Kiel_Hulk.jpg/revision/latest?cb=20171102194847

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