TL;DR: unless you click on “search” or “activate comments”, nothing will happen.
Google Custom Search Engine
This site uses Google CSE for the site search.
If you do not want that, simply don’t use the search function. It will not load anything at all unless you click on search.
I use Disqus for the blog’s comment system.
Note that Disqus is not loaded by default. Their script will only be activated if you click on the corresponding button. By clicking so, you agree to Disqus policy.
If you do not click on the button, Disqus will not be loaded and it has no effect at all.