Contradiction with Matthew 28:19
This verse instructs the disciples to go and teach all nations, which contradicts the contention in Acts 11:2 about preaching to the Gentiles.
Matthew 28:19: Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: [teach...: or, make disciples, or, Christians of all nations]
Contradiction with Mark 16:15
Jesus commands to preach the Gospel to every creature, contrasting the criticism faced in Acts 11:2 regarding preaching to Gentiles.
Mark 16:15: And he said unto them, Go ye into all the world, and preach the gospel to every creature.
Contradiction with Acts 10:34-35
Peter recognizes that God accepts people from every nation, contradicting the objection to Gentile interaction in Acts 11:2.
Acts 10:34-35: Then Peter opened [his] mouth, and said, Of a truth I perceive that God is no respecter of persons:
Contradiction with Galatians 2:11-14
Paul opposes Peter for backing away from Gentiles, highlighting the ongoing conflict seen in Acts 11:2.
Galatians 2:11-14: But when Peter was come to Antioch, I withstood him to the face, because he was to be blamed.
Contradiction with Romans 10:12
There is no difference between Jew and Greek, conflicting with the criticism of Gentile interaction in Acts 11:2.
Romans 10:12: For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him.