Nichelle Nichols: In "Plato's Stepchildren," Uhura and Kirk were supposed to kiss under duress from their captors. It became an issue with the director and Gene Roddenberry finally decided to shoot the scene with and without the kiss. Bill Shatner kept kissing until there was only time for one more take. When the camera zoomed in, Bill crossed his eyes and the director didn't notice it until the next day in dailies. Of course the last scene was unusable and they had to go with the kiss scene, which became history as the first interracial kiss on TV.
Nichelle Nichols: The day Jimmy Doohan fell into the water off the Bird of Prey. All the actors in the live scene thought it was a joke and jumped in after him. Nimoy, who was directing the film, was flabbergasted but quickly jumped in with them and screamed at the camera crew, "Keep shooting -- keep shooting!" It turned out to be a keeper and one of the best shots in the movie.
Nichelle Nichols: The day the actors took Leonard Nimoy's bike (which he used for transportation around the Paramount lot) and hung it in the rafters on the soundstage. He didn't find it for days, until they finally pointed to it.