In 2nd Edition D&D, it mentions in the Player's Handbook that Half-Elves can multiclass as Ranger/Druid. This is a contradiction with the alignment rules, stating that a Ranger must be Good and a Druid must be True Neutral. The book never elaborates on this further, leaving the reader to wonder if this was a typo, or whether certain special exceptions occur.
Is it possible that such a character can exist as either True Neutral or Neutral Good? Perhaps they are the precursors to the Druids of 3rd Edition, who are allowed to be any Non-Corner Alignment, thus allowing for Neutral Good to be the only acceptable option? Perhaps it's just a mistake in the book, and this class combination is completely bogus?
Edit: After some consideration, I would like to keep this question open. A major facet of the question is the original intent behind this text. Separate of the eventual ruling, whether made by errata, retcon, or supplemental material, the question still remains on whether this was a typo at the time of the printing of the PHB. While this might be difficult to determine, the presence, or lack thereof, of references to the race/class combination or of similar characters from around the time that 2nd Edition began may serve as proof in either direction.