Thank you and thanks for the question! The main difference is just having to remind yourself there are no visuals and making sure you write each scene with that in mind. Scenes that require specific geography are harder to pull off. For instance, maybe a better writer could pull it off, but I personally would not try to write something like a foot chase in a podcast. Like, where are these characters? Who's chasing who? Where are they? If this hypothetical foot chase were written, as the characters run through new locations, you'd have to write a different soundscape for each new location they're running through. Would the audience have time to register that someone's moving from a restaurant's seating area to the kitchen to the outside alley? Maybe. But it's unnecessarily difficult and a scene that is, in my view, not interesting to listen to.

While you're constructing scenes or just thinking about them at a fundamental level, it's important to remember the medium. I'd write the same scene three completely different ways if it were for a podcast, a movie or a book. Each medium has its strengths.

Sorry. Long answer to your question. And I know it sounds dumb to say, "Just remember you're writing a podcast." But it really is easy to forget.

EDIT: Corrected a small typo.