Also, on a side note, is there a way to get only Template:Dia to be transcluded, leaving out the headers, the tabs at the top, the Category:Transcriptses, and the Template:DiaEmptys?

Click on "Show preview" and you will see the reason

Without modifying the page itself, no, there's no way to leave out specific elements with the way those transcript pages are constructed.

^^so how do i fix it? is it too long to fit in a page at all?

Possibly, a page has a post-expansion limit of about 2MB.

However, you can probably save a lot of Wikitext by refactoring Template:Dia, use better constructs than a "table" and move all the styles to the wiki's CSS or to a TemplateStyles template.

Regarding leaving out Template:DiaEmptys, yes you can add a condition to prevent it from being rendered on a certain page or on the main namespace etc.

^

1. whats a construct

2. whats refactoring

3. i dont see any tables anywhere

4. Template:DiaEmpty is the one i LEAST want to get rid of, it wont clean it much