I noticed that under "Discussion Settings" that I had unchecked the "Follow Blog" button, thinking that I didn't want there to be a "Follow Blog" button in the comment form.
You did right, and that won't affect how subscriptions are sent. it just means that your readers can't subscribe to your site while commenting; they can only use the subscription widget you've added to your sidebar.
I have an option on the right for "Post Format" I can choose from "Standard" "Gallery" "Video" "Audio" "Link". I choose "Video" because the site is designed as a web series
It seems like you theme uses Post Formats. That's a theme feature available in WordPress, and doesn't affect Jetpack subscriptions.
Next, I add a video embed code in field inside a special "Post Formats" box.
This, however, seems like a custom feature added by your theme, and means that the content you add in that box won't be delivered to your subscribers.
I checked our email logs for some of your subscribers again, and it seems that your last post was correctly sent to your subscribers on the 29th at 00:09 UTC (about 14 hours ago). If you still experience issues, could you send me an email with some examples of the email addresses that did not receive the notification?
If you mention this thread, I'll be able to follow up with you.