I've found that my attachment templates are inheriting the enqueued scripts for single posts. My first instinct was to unenqueue these scripts one-by-one or to do an is_attachment() check before ...
Say a theme "foo" is used on across a network of sites. In each site, all the theme resources (.css, .js, etc.) will have distinct URLs: http://network/siteA/wp-content/themes/foo/style.css ...