A few examples but concludes with don't change anything. Can't believe they mean that.
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Historical FAQ
Some settings in here do not play well with other settings. It is best to use the Historical League Creation Wizard when making your games. If you set some settings like Retire According to History on with Player Miss Seasons According to History but do not use Use real historical transactions, have Import& Maintain Real Minor Leagues turned off, you might not have enough players in your league to play. Each Historical Wizard has been setup for certain ways to play the game. It is best to just use them over turning on and off settings that might have a negative impact on your gaming experience.