Final answer:
Biff's overall opinion of his father changes dramatically during the scene as he witnesses his father's affair and confronts him about it.
Step-by-step explanation:
In the scene, Biff's overall opinion of his father changes dramatically. Initially, Biff holds his father in high regard and idolizes him, seeing him as a successful and influential figure. However, as the scene unfolds, Biff begins to see his father's flaws and deception. He witnesses his father's affair with another woman, which shatters his perception of Willy as a devoted family man. Biff becomes disillusioned and confronts his father about the affair, leading to a heated argument and a complete shift in his opinion of Willy.