Tony Zhou put together this great video on how to add visual comedy to your film. Tony talks from the perspective of the director, but many of the things he talks about can be written directly onto the pages of the script (the bit about transitions in particular).
Warning: this video will make you lose a bit of respect for some of your favorite comedies from the last few years, because you’ll see how much better they could have been if the director had been a bit more creative with the camerawork.
Second warning: Don’t start writing camera angles into your scripts after watching this video. Do start thinking about the ways that you’re describing what you want your reader to see. You can impose a camera angle in a reader’s brain without writing ANGLE ON.