Jennifer O'Neill had already been cast as Dr. Kate McCrae when Disney informed her that she would need to cut her long hair for the film's weightless and zero-gravity sequences. Although initially reluctant, O'Neill eventually agreed and brought her own celebrated hairstylist, Vidal Sassoon, to the studio for the transformation. The haircut became an unusually theatrical production event: O'Neill reportedly drank several glasses of wine during the session, left the studio visibly intoxicated, and was subsequently involved in a car crash that resulted in her hospitalization. Disney removed her from the project, and Yvette Mimieux was cast the following day. Mimieux also agreed to have her long hair cut, but avoided the mishap that had abruptly ended O'Neill's participation. The incident is a striking example of how a seemingly minor appearance requirement, combined with an actor's off-camera behavior, could derail a major studio casting decision just before filming.
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