One thing to note is that the very first round of printing accidentally omitted one comic strip as Griffin pointed out here: http://www.housepetscomic.com/2011/10/30/comic-will-be-late-8/#comments
For anyone who is curious, the strip omitted was this one: http://www.housepetscomic.com/2009/12/04/try-to-understand/
As Rick said in the comments to his post, he has corrected this, though it cost him quite a bit of money, so he may have to charge return shipping for people who wish to replace their books.
More information about formatting options
One thing to note is that the very first round of printing accidentally omitted one comic strip as Griffin pointed out here: http://www.housepetscomic.com/2011/10/30/comic-will-be-late-8/#comments
For anyone who is curious, the strip omitted was this one: http://www.housepetscomic.com/2009/12/04/try-to-understand/
As Rick said in the comments to his post, he has corrected this, though it cost him quite a bit of money, so he may have to charge return shipping for people who wish to replace their books.