Contradiction with Acts 15:1-2
These verses suggest that Paul did not go to Jerusalem by revelation, but rather went because of a dispute regarding the necessity of circumcision for Gentile believers, which is not mentioned in Galatians 2:1.
Acts 15:1-2: And certain men which came down from Judaea taught the brethren, [and said], Except ye be circumcised after the manner of Moses, ye cannot be saved.