In Section 8.2.3 of the STIS IHB on page 181, the link given for obtaining target coordinates in the GSC reference frame no longer works. The correct link is http://gsss.stsci.edu/HSTsupport/HSTsupport.htm.
In Section 14.8 on page 462, the table giving Imaging Bright Object limits as a function of visual magnitude was inadvertently omitted. A copy of this table can be found here.