27 years later and I still don't know what Dexter is doing here.

He's timing his voice with a story board for a cartoon.

🚨🐔 Your hen is missing, and there's no time to waste! Dive into this freaky rescue mission starting Freaky Trip now! 🎮 Join the adventure on: 🕹️ Nintendo Switch: 💻 Steam: #NintendoSwitch #Steam 🎥 Watch the trailer below! 👇

Inside story boarding joke a lot of fourth wall breaking happens in this episode

Storyboard timing in a nutshell.

He’s timing a storyboard.

Look at his paper. It’s a very simple storyboarding sheet. This is an in-joke or gag about animation syncing with mouth movements.

I think he was doing a wild take for a character's extreme facial expression in shock.

After understanding it's a storyboard joke, I wonder if the storyboard is just him timing the framing of him timing the framing. Also, if I remember I think this is the beginning of "Continuum of Cartoon Fools". Please correct me if I'm wrong

He's filling in a "dope sheet," a thing animators use to figure out how many seconds each sequence should be. It's kind of an inside joke.

he‘s just making a cartoon