Re: No female starship captains in the 2250s-60s?
I always thought the most glaring mistake Janice was making was how she always referred to herself as captain. It was always "Captain Kirk here," "Captain Kirk out," which most of them, especially Spock and McCoy, should have picked up. Kirk himself usually dropped the rank title.
Dr. Howard, Dr. Fine, Dr. Howard: For duty and humanity! --Men in Black (1934)