Was Carol Marcus' appearance purposefully made to be identical to Elizabeth Dehner, so that the fans might guess that the bad guy was going to be Gary Mitchell?
Blonde hair worn in a similar cut (though parted on the opposite side) constitutes "appearance purposefully made to be identical to Elizabeth Dehner"? Besides that, the fact that both wore a blue uniform, and that neither were male, Eve's Marcus and Kellerman's Dehner really don't look that much alike.
"If the man doesn't believe as we do, we say he is a crank and that settles it. I mean it does nowadays, because we can't burn him."
— Mark Twain, from Following the Equator