P. 14. There is no chart or diagram. Under Boskone's Organization, replace the first two sentences of the first paragraph with "Boskone believed in multiply-redundant structures. Parallel observers monitored all critical positions in the Boskonian system." Replace the first sentence of the second paragraph with "Any chart of a Boskonian command and control system must be far from complete or conclusive."
P. 33. Horrific Appearance gives a +4 bonus to Intimidation.
P. 40. In the second paragraph under Velantians, the Increased Speed should be +5.
P. 55. At the top of the second column, replace the "1/2" symbol with "2-1." Medon moved from the 2nd to the 1st Galaxy.
P. 79. In the third paragraph under Sunbeams (TS8), replace "dodecahedron" with "icosahedron".
P. 102. Under Extended Range, add "The range of touch-only telepathy cannot be extended by these enhancements."
P. 116. In the second paragraph of the sidebar, replace the phrase "multiple asteroid impacts" with "a comet strike."
P. 124. Replace the first two words of the tenth paragraph, "I glared," with "You glare."
P. 126. Under The Lensman Series, the correct order is Triplanetary, First Lensman, Galactic Patrol, Gray Lensman, Second-Stage Lensmen, Children of the Lens. Masters of the Vortex was written just after Second-Stage Lensmen, but is only tangentially part of the series, and was collected in one volume several years after all of the other volumes had been published.