In some of his interviews I have heard him go into some of the causes of WWII. He mentions, not only WWI, but also the trade restrictions against Japan. When discussing the first WW, he often mentions the Treaty of Versailles. The Treaty of Versailles is sometimes mentioned as part of the cause of the current war in Iraq. I have also heard him say that trade restrictions are an act of war.
Many times he will often argue something from the ‘unconstitutional’ perspective rather than giving a more detailed argument, something he has done on other occasions. I think it is sometimes because of the audience and time. ‘Unconstitutional’ is often quicker and more persuasive than a history lesson.
He has also compared the Pearl Harbor attack to the September 11 WTC attack by saying that a policy caused the incident, but a response is still justified.
I have listened to just about every recording of his on ronpaulaudio.com so I think I have a good feeling for what he thinks about something and how he handles interview questions.