It is not surprising that anyone can spot errors easier on his or her field of knowledge. Ask just anybody on which field journalists (newspapers) are least reliable and you know what this person knows most about.

When Velikovsky published his crackpot book trying to point out that certain historical facts could be explained by assuming that Venus had come very close to Earth in historical times, many people were astonished by the wealth of details in the book. One day, a physicist and a paleontologist met who both had read Velikovski's book. Both thought that the book was full of errors in one particular field of knowledge but were impressed by Velikowsky's scholarship on other fields. You may have guessed by now, that the paleotologist was impressed by Velikovsky's physical knowledge which the physicist thought to be close to nil and vice versa.

Wolfgang