editing style- Casablanca uses continuity editing in the film. so the audience can understand the conversation in their point of view.

here is an example of a shot reverse shot. this happened at about a quarter way through the film where the two characters are having a conversation about something serious, so you can see the point of view.

the shot here is a reaction shot where you can see the two characters having an upset conversation and you can see how Ilsa reacted to Rick telling her no towards leaving with another man. they used a reaction shot so they can really see how what Rick said effected her deeply, and you can really see the sadness in her eyes.