I just upgraded to 2.4.0 from an earlier (don’t remember which—a couple versions behind) version and the Edit screen in the control panel broke, giving an error that exp_comments doesn’t exist.
This is true, since I never installed the comments module. I’ve fixed the error by installing Comments, although I would rather not have unneeded modules installed. Mostly, I thought you might like to know that the latest version appears to assume Comments is installed and is not handling cases where it is not installed correctly.