A little more information would help such as the exact title, author, publication date and so on. Also, a few examples that would illustrate the problems you found and your reason for believing they are erroneous would be helpful.

Perhaps because the heresy of Modernism had already entered the Church long before the Vatican II Council. Probably during the second part of the XIX century. Not for anything, Pope St. Pius X wrote his excellent encyclical "the Oath Against Modernism" in 1910, and his precedent Pope Pius IX, the "Syllabus of Errors" in 1864. Liberalism was already rampant in the hierarchy in the 50's.

Sorry, it just became clear that you were referring to the slimy Jesuit Jungman's book.  He was obviously very instrumental in bringing forth the Novus Ordo.

Cardinal Spellman is the imprimatur.  

How did this get published and authorized? Cantarella is correct. The sewer lid was already off, and waiting for more fools  to fall in.

I hope you didn't read both volumes to find this out.

Ok, page 300 under the chapter "Calvary of the Catholic Church."  "The distribution of this pastoral letter(Prague, June 15 1949) was a remarkable achievement, sinice the bishops' consistory offices remained in occupation of government secret police and officials, who were using their seals and their stationery freely, so that, as one pastor explains, the very imprimatur on any new publications must be regarded wit suspicion as possibly a forgery. Foot note which I am not sure what it is referring to (CIC, canon 329, 335)

This book is very explicit.  Deep explanation of all the take over of Czechoslovakia.  Mercy, Russia just took her, a complete take over!  Not to mention all the murders, labor camps, take over of all land and in this case all literature.