Continuity mistake: Episode 2x13, "In God We Strongly Suspect": When David and Maddie are in the mortuary and David is rambling about birthdays, he licks birthday cake icing off his finger and removes said finger from his mouth. In the next shot, the finger is back in his mouth.
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Continuity mistake: Episode 2x15, "Witness for the Execution": When David and Maddie are debating whether or not to help Lawrence Everett, the towel David uses to wipe shaving cream off his face jumps around during the scene. It's around his neck, then in his hands, then on his shoulder, and back in his hands, etc.