Here's GW's official corrections and errata, some of the formatting has been lost, so you may want to get it direct from the GW site:
http://www.games-workshop.co.uk/wfb6_corrections.htm
Page 4: Change the name Sloboda to Sleboda
Chariots section: The entry ŒChariots challenges¹ should be Chariot Challenges
Page 80 Third paragraph: (Charged in the sideŠ): Delete the whole of the last sentence: Also, no test is required.
Page 81 Fear (second paragraph): Delete the repetitive the 1. If Charged by a Fear-Causing Enemy (third paragraph): Replace Œhigher than¹ with equal to or higher than
Page 94 Characters (first paragraph): Replace Œgreat Heroes, valiant Champions,¹ with great Lords, valiant Heroes,
Page 95 Independent Characters Joining Units: Delete the first two lines of the first paragraph so it starts: Characters can
Page 116 Diagrams: Replace the ŒSkirmishers charging (a)¹ and ŒEnemy charging skirmishers¹ diagrams with the ones supplied with this corrections list. Download P116 PDF
Page 144 Wall of Fire: First Paragraph. Add after the paragraph: This spell cannot be cast on units which have a 360º arc of sight Wall of Fire. Third Paragraph. Remove the sentence: For example, six models in the front rank would suffer 6 hits
Page 145 The Lore of Metal (Bane of Forged Steel): Change Œaffected units are assumed to use hand weapons instead¹ to affected units are assumed to use their fists/claws etc, instead
Page 149 The Lore of Light (Pha¹s Illumination, first paragraph): Delete Once it has been cast, the spell lasts until the Wizard attempts another spell or until it is dispelled
Page 154 Dispel Scroll (header): Replace the word Œscroll¹ in brackets (after the points cost) with Arcane Dispel Scroll (fourth paragraph): Replace: ŒAny spell that is successfully cast with a result of 12 is irresistible¹ with Any spell that is successfully cast with two or more 6s is irresistible
Page 176 Of the Ratmen of the Underworld (third paragraph): Change: Œa parchment which is said to been written¹ to: a parchment which is said to have been written
Page 197 Scenario chart (scenario 5): Change Œflanking force¹ to: flank attack
Page 208 Victory conditions (second to last sentence in this paragraph): Change the word Œbanner¹ to objective
Page 211 Rear Guard (Overview): Change Œoutnumbered defendering force¹ to: outnumbered defending force
Page 239: Under the heading Selecting Units at the bottom of the second column, on the Troop chart, the last entry under ŒRare¹ should read +0-1 instead of +0.
Page 253: At the beginning of each Damage Chart (Wall Damage chart, Tower Damage chart, Gate Damage chart) change Œ2D6¹ to Damage
Page 268 Figure 2b.: The diagram has been flipped and the icons muddled around. A correct scan for figure 2b (merged and unmerged) is supplied with this document. Note that the word YES still accompanies the units on the left of the diagram, and the word NO still accompanies the units on the right of the diagram.
Figure. 3: Remove the word target in the centre of the diagram.
Figure 5: Replace this diagram with the one supplied with this corrections list. Download P268 PDF
Page 269 Fast Cavalry (paragraph 3): Replace the entire paragraph with: If a unit of Fast Cavalry rallies, it will be able to move normally in that same turn and will not have to remain stationary like normal units
Page Flying Models: Change the ŒFlying models¹ header to: Flyers
Page 273: Roll to hit. Second sentence. Remove the words: ŒCavalry models¹ at the beginning of the sentence and replace with the words: When attacking cavalry,
