This study investigates the effects of two explicit types of corrective feedback techniques, explicit recasts (declarative partial recasts with the correct form) and metalinguistic clues (metalinguistic information without the correct form) on the acquisition of two Korean target forms, demonstratives and indirect quotation, which differ in the degree of the learning difficulty they pose in terms of either the meaning or form. The study employed a pretest-posttest-delayed posttest design with two treatment sessions between the pretest and the posttest. The participants included 26 Korean adult learners who were randomly assigned to two experimental groups and a control group. The results show that both explicit recasts and metalinguistic clues are effective in promoting the acquisition of the demonstratives. For an indirect quotation, only the metalinguistic group significantly differed from the control group, even though the two experimental groups were not significantly different.