Could be much better.

I have an event calendar installed and it does not appear on those pages despite “entire site” being selected in options.

Also the area it uses is taking up 100% width of the page content area which pushes down page content when placed at the top of the page. So you have a large empty space on the page with the like button only taking up a very small part of it. Adding a class so we can float it and give it a max width would be helpful. I would use the shortcode option but I have hundreds of pages and don’t want to update them all manually.