New answers tagged playwriting
Your use of the phrase "to make a point" throws me off a little, but it sounds like you're describing exposition.
You'd use the character name. Most screenplays are written well before they're cast, so it would be impossible to use the actor name. And even if you knew the actor (like, it was part of a series) you'd use the character name because it's the character saying the line, not the actor. ETA: You can see this, for example, in the screenplay for Empire Strikes ...
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