Contradiction with Acts 1:23-26
This passage describes the selection of Matthias as an apostle, which contradicts the fixed number and names of the apostles in Matthew 10:2.
Acts 1:23-26: And they appointed two, Joseph called Barsabas, who was surnamed Justus, and Matthias.
Contradiction with Galatians 1:1
Paul declares himself an apostle, though not listed among the original twelve in Matthew 10:2.
Galatians 1:1: Paul, an apostle, (not of men, neither by man, but by Jesus Christ, and God the Father, who raised him from the dead;)