Everything is true which relates to salvation, but the Bible may err on matters such as science and history. The Bible does not attempt to be an authority on such matters. When Paul mixes in teaching that comes from his Rabbinical days he is actually adding comment to the Lord's inerrant revelation. Addressing Problems Original manuscripts are without error. Today's manuscripts have differences.
Differences make no change to any doctrine.
Manuscripts are adequate for knowing the total error free knowledge that God has revealed to mankind. Errors in interpretation can be significant. Now these things, brethren, I have figuratively applied to myself and Apollos for your sakes, so that in us you may learn not to exceed what is written so that no one of you will become arrogant in behalf of one against the other. Applications of These Doctrines Study the Word of God, for it is His words to us, profitable for teaching. Be aware of your own fallibility in interpreting Scripture and humble yourself before the Word.