For Mark, I appeal to the Early Church Fathers who long predated the Council of Carthage, Hippo, and Rome. As far as I know, none of them, not even the earliest ones, doubted the authorship of Mark.
For Revelation and 1 Clement, there were some who held that 1 Clement is canon in the early church, while others who did not. Same for Revelation. To this, I appeal to the fact that the Early Church did not see the Canonicity of Scripture as an critical controversy that levels to that the Christologies, for they also have the oral traditions and liturgical church practices to mantain the Apostolic teaching. No Apostolic teaching stands or falls on whether 1 Clement is canon, anyway. It was ultimately the three local councils I mentioned above who made the 27 New Testament books the norm in all Christian circles, but that is not the same as saying that the Catholic Church is infallible in all matters of faith and practice.