Before anybody says 'Kirk says that Klingons don't take prisoners yet we see them do it all the time!', I'd like to suggest you selectively hear the line:
Saavik: Suggestions, Admiral?
Kirk: A prayer, Mr. Saavik. The klingons don't take prisoners.
as
Saavik: Suggestions, Admiral?
Kirk: A prayer, Mr. Saavik, that klingons don't take prisoners.
That way we can interpret it as Kirk saying 'you'd better pray they kill you rather than take you prisoner' and thus avoid 43 years of continuity violation.
Saavik: Suggestions, Admiral?
Kirk: A prayer, Mr. Saavik. The klingons don't take prisoners.
as
Saavik: Suggestions, Admiral?
Kirk: A prayer, Mr. Saavik, that klingons don't take prisoners.
That way we can interpret it as Kirk saying 'you'd better pray they kill you rather than take you prisoner' and thus avoid 43 years of continuity violation.
