In the company I currently work on, this is checked:
- If binary files have the needs lock attribute set;
- If the Java files have the standard copyright notice and if it includes the current year;
- If the code is properly formatted (we use Jalopy for code formatting) - this may sound silly but it actually makes text comparisons between different versions easier;
- If the code has a commit message;
- If the directory structure conforms to what is defined (all projects should be under a defined SVN folder, and each project should have a tags, branch and trunk folder);
I guess that's it.
I like the idea of checking if the commit is associated with a ticket; it actually makes a lot of sense to me.