This card referes to gates to Another Time have their difficulty to close increased/ Since Another Timre is a gate in Dunwich Horror, is this a typo? If so, do they mean Another Dimension?

Nope, they definitely mean "Another Time." This is one of the very few cards that considered components from previous expansions.

Another one is "Repairer of Reputations" (KiY) which mentions Detriment cards (CotDP).