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Give things Fast Healing, especially things that aren't supposed to have Fast Healing. Nothing gives you that horror movie "jump" like thinking you have an encounter over and done with, standing around healing, maybe considering resting, etc., when one of the "corpses" on the floor suddenly grabs your ankle.
Describe things like zombies as coming to pieces at the first successful hit ... but the separate parts continue to attack until enough damage is dealt to get it down to 0 hp. You don't have to change up the stats; just apply its attack to a limb pulling itself across the floor or a head rolling after the PCs and biting while the other parts "miss." Even though the mechanics are straight out of the Bestiary, the players will feel like they're harder to kill.