Hot answers tagged screenwriting
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 ...
Just skip to the next plot point and write that. Chances are that later on you'll think of a way to bridge the two, and then you can come back and fill in the details when that happens. I would guess that very few writers proceed sequentially through an entire work. It's good to jump around when you're finding yourself stuck; there's no point in stagnating ...
Do you have some other parts of the story worked out? I would just jump ahead for now and write the next scene that you "know". Then, before you know it, you can fill the gap.
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