I was adding a new release to Eric Clapton's album "Eric Clapton", and in the release group dropdown I could see 3 albums all called Eric Clapton and no way to distinguish them.
In some cases there is a disambiguation field which is visible (for example, there are several Beatles albums called "The Beatles", and "The White Album" is discernible in this way).
There's a need for always being able to see unambiguously what the release group is.
a) include the first few digits of the release group id
b) allow pasting of the full release group id or the url of the release group page
See also comments on http://musicbrainz.org/edit/24127074