There are a few reasons why you might not see posts on this friends page:

• GoComics.com - Garfield by Jim Davis might have no friends defined. If you are GoComics.com - Garfield by Jim Davis, you can edit your LiveJournal friends so they show up here.
• GoComics.com - Garfield by Jim Davis might have friends defined, but all of their friend's posts might be over two weeks old (according to the times on our servers), and thus wouldn't be displayed here.
• GoComics.com - Garfield by Jim Davis might have friends defined that post only protected entries that you can't view, because they haven't defined you as a friend in return.