Final answer:
The reader should use the look on David's face as a detail to check the prediction that Jake will look for Dean.
Step-by-step explanation:
The detail from part 2 of "For the Win" that the reader should use to check the prediction that Jake will look for Dean is the look on David's face (1.2.2.24). This detail shows that David is deep in thought and expressing a soft veil of fear, which suggests that something significant is happening or about to happen, possibly leading Jake to search for Dean.