I found some more notes I took while reading The Perfect Screenplay by Katherine Atwell Herbert:

Each scene needs to:

• Have a purpose and story arch
• Tell a small piece of the story
• Push the plot forward
• Reveal something about the characters 

When writing dialogue:

• Save the most important information until the end
• Give each character a unique voice
• Make sure the characters are doing something while talking; avoid talking heads

 Act I:

• Introduces the main characters, their relationships and personalities
• Establishes the setting and time period

 Act II:

• Includes complications and subplots and reveals more about each character
• Shows the personal side of the protagonist by revealing what he would do if all his problems were solved
• It’s here that things get really bad and the protagonist loses all hope in himself
• Remember to dramatize the theme
• Vary the tone, rhythm and length of scenes to keep things interesting
• Use subplots to add texture and cultural variety

 Act III:

• Often opens with the main character at a low point
• Main character somehow gathers himself together to try again
• Encouragement to keep going may come from another character
• Eventually the main character figures out what’s been holding him back and preventing him from reaching his goal

 Climax:

• Make sure the hero is on stage and facing the antagonist
• Don’t rush this scene 

Post climax:

• Often includes a hint of marriage or a promise of a future relationship