In the play the Crucible, what facts are presented in Act One by means of antecedent action?

Arthur Miller relies upon several statements by his characters in Act 1 to inform his audience of prior events.

1. Through Rev. Parris's conversation with Abigail at the beginning of Act One, we discover that she, Betty Parris, and others were in the forest--not a setting for any decent Puritan girl.  As the conversation advances, we also find out that the girls seemed to be dancing and performing some type of ritual.

2. The tension between Rev. Parris and the rest of the town becomes evident not only through the playwright's notes in Act One but also through his interaction with the Putnams, Giles Corey, and especially John Proctor.

3. Early on in Act 1, Miller makes it clear through Parris's questioning of Abigail that she was fired from the Proctor household and that has caused a lot of speculation in the town.

4. Finally, when Proctor and Abigail talk privately in Act One, they demonstrate that an adulterous affair occurred between them before the play's action/dialogue.