Read the excerpt from part one of trifles. hale. i didn’t hear or see anything; i knocked at the door, and still it was all quiet inside. i knew they must be up, it was past eight o’clock. so i knocked again, and i thought i heard somebody say, “come in.” i wasn’t sure, i’m not sure yet, but i opened the door—this door (indicating the door by which the two women are still standing), and there in that rocker—(pointing to it) sat mrs. wright. (they all look at the rocker.) how does the underlined stage direction affect the mood of the scene?

The underlined stage direction (They all look at the rocker) affects the mood of the scene by adding tension to it. As all the people present look at that rocker, they are reminded of Mrs. Wright, sitting in that very spot, calmly talking about her dead husband.

The way in which the underlined stage direction affect the mood of the scene is

This refers to the coordination of the performance of the actors on stage when performing a drama to an audience.

With this in mind, we can see that from the given text, there is the use of stage directions to show that there is a mood change which heightens the tension in the stage.

Read more about stage direction here:
link

3 is blunder, i’m not sure about the last one but the first two look correct