It is always a good idea to print a test copy of your rack card prior to going to production. Make sure your artwork lines up correctly and isn’t running too close to the edge of the document.
If possible, always have someone who has not seen your rack card, read it to make sure it gets the message across you were going for.
Do you have your website, facebook, twitter or phone number on your rack card? Try adding a QR code to your artwork and link it your website.