The two take-out cups of coffee Agnes brings to the crime scene would presumably both be full, but the way they are handled and waved around without spilling a drop, they are obviously empty prop cups.
Given the role these scenes played in the overall narrative, however, the error can be seen as mocking what is a frequent gaffe in the genre, and may have even been purposeful therefore.
Given the role these scenes played in the overall narrative, however, the error can be seen as mocking what is a frequent gaffe in the genre, and may have even been purposeful therefore.