None. Catholics, particularly members of the clergy, are forbidden from joining the Masons.
Yes, they had many differences on matters of authority and doctrine. Some Popes were even excommunicated by Church Synods (or Councils) and other rival Popes were elected in their place, called Ante-Popes.
There have been 13 popes named Innocent.
There have been no popes named Kenneth.
There have been no popes named Jude.
217 popes have been born in Italy.
There have been 117 Popes of the Coptic See of Alexandria (Orthodox)
As of April 2013 there have been 266 popes.
There have been 217 Italian popes and only 49 non-Italian popes.
There have been a total of 265 popes including Peter.
There have been 8 popes called Urban.
There have been 6 popes named Sixtus.