Roman Catholic apologists are notorious for arguing that sola Scriptura must be illegitimate because it has resulted in so many differences of opinion on doctrinal issues. I've responded to this erroneous line of argument elsewhere (see the Roman Catholic Challenge, as well as 30,000 Protestant Denominations?). Ironically enough, these same Roman Catholic apologists demonstrate just as many (and far more significant) internal divisions than the Evangelical churches they lament. Below are some interesting links that show the very real differences of views among even conservative Roman Catholics.
http://www.catholicintl.com/epologetics/Works_of_the_Law.htm (although he doesn't name them specifically, Robert Sungenis disagrees with other Roman Catholics [such as James Akin and Scott Hahn] on the significance of the law. Compare this article with James Akin's views at http://www.cin.org/users/james/files/paul_law.htm and http://www.cin.org/users/james/files/work-law.htm)
http://www.catholicconvert.com/wwwboard/messages/92508.html (an exceptionally ironic post on a popular Roman Catholic message board. Note particularly the closing thoughts of the poster. He doesn't happen to like agree with the teaching at his current parish, and so he actively seeks another parish whose beliefs he can accommodate. Anyone who has ever heard the RC argument "if a Protestant doesn't like his church he just walks down the street and joins another one" will be struck by the irony of this one)
http://ic.net/~erasmus/RAZ506.HTM (Dave Armstrong vs. Mark Shea and Greg Krehbiel)
http://www.cathinsight.com/apologetics/debates/sippo/index.htm (Artie Sippo vs. Adam Kolasinski)
http://matt1618.freeyellow.com/shawn.html (Shawn McElhinney vs. Traditionalist Roman Catholicism)
http://www.cathinsight.com/apologetics/papalcriticism.htm (Adam Kolasinski vs. Shawn McElhinney)
http://www.cathinsight.com/apologetics/asgoodas.htm (Mario Derksen vs. the Novus Ordo Mass)
http://www.cathinsight.com/apologetics/luka.htm (More Mario Derksen vs. the Novus Ordo Mass)
http://ic.net/~erasmus/RAZ465.HTM (Dave Armstrong vs. Mark Cameron)
http://ic.net/~erasmus/RAZ221.HTM (Dave Armstrong vs. Roman Catholic Traditionalists)
http://ic.net/~erasmus/RAZ389.HTM (Dave Armstrong vs. many, many Roman Catholic Traditionalists)
http://www.ewtn.com/library/SCRIPTUR/FEENEY.TXT (Fr. W. Most vs. Feeneyite Roman Catholics)
http://matt1618.freeyellow.com/adam.html (Vatican II RC apologists vs. Feeneyite apologist)
http://www.cathinsight.com/apologetics/recipe.htm (Randy Day vs. Vatican II)
http://www.fatima.org/library/cr67pg25.html (Fr. Paul Kramer defends Fr. Nicholas Gruner against other Roman Catholics)
http://www.seattlecatholic.com/article_20011102_The_Spirit_of_Ecumenism.html (Peter Miller, Traditionalist RC vs. the "spirit of Vatican II")
http://www.dailycatholic.org/ (The Daily Catholic--Tridentine True! vs. the rest of the Roman Catholic world)
http://www.seattlecatholic.com/ (The Seattle Catholic vs. Vatican II)
http://www.geocities.com/romcath1/davies2.html (Mario Derksen vs. Stephen Hand vs. Michael Davies)
http://www.diocesereport.com/myview/myview_mershon_03_2001.shtml
(Brian Mershon vs. "the Disaster of the Second Vatican Council")
http://www.ewtn.com/library/scriptur/destbib.txt
(John Young vs. The Jerome Bible Commentary)
http://www.catholicconvert.com/wwwboard/messages/64897.html (Robert Sungenis vs. Einsteinian Roman Catholics)
http://www.catholicconvert.com/wwwboard/messages/63642.html (more "Traditional" vs. Vatican II crowd).