I'll give one example. In Acts, the 12 Apostles discussed things and said Gentile converts should not eat food sacrificed to idols; but Paul said it's okay.
Acts 15:29 That ye abstain from meats offered to idols, and from blood, and from things strangled, and from fornication: from which if ye keep yourselves, ye shall do well. Fare ye well.
Acts 21:25 As touching the Gentiles which believe, we have written and concluded that they observe no such thing, save only that they keep themselves from things offered to idols, and from blood, and from strangled, and from fornication.
Yet Paul seems to think it was okay to visit a pagan temple and eat the food that had been offered to idols. His objection to doing it was only that it might make someone weak in faith stumble -- were the 12 apostles weak in faith when they forbid it?
1 Corinthians 8:7 Howbeit there is not in every man that knowledge: for some with conscience of the idol unto this hour eat it as a thing offered unto an idol; and their conscience being weak is defiled.
8 But meat commendeth us not to God: for neither, if we eat, are we the better; neither, if we eat not, are we the worse.
9 But take heed lest by any means this liberty of yours become a stumblingblock to them that are weak.
10 For if any man see thee which hast knowledge sit at meat in the idol's temple, shall not the conscience of him which is weak be emboldened to eat those things which are offered to idols;
Why make things so complicated? Why seek to undermine the simple directive of the twelve apostles?
Jesus condemned eating food offered to idols twice in Revelation.
Revelation 2:14 But I have a few things against thee, because thou hast there them that hold the doctrine of Balaam, who taught Balac to cast a stumblingblock before the children of Israel, to eat things sacrificed unto idols, and to commit fornication.
20 Notwithstanding I have a few things against thee, because thou sufferest that woman Jezebel, which calleth herself a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed unto idols.
I Corinthians 10 has a passage about food offered to idols too. It also has another strange passage which suggests to me no learned Jew would have written:
I Corinthians 10:7 Neither be ye idolaters, as were some of them; as it is written, The people sat down to eat and drink, and rose up to play.
8 Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.
Paul said he studied under Gamaliel, a very famous rabbi. I can't believe a student of Gamaliel would have made such a mistake.
Exodus 32:6 And they rose up early on the morrow, and offered burnt offerings, and brought peace offerings; and the people sat down to eat and to drink, and rose up to play.
. . . .
28 And the children of Levi did according to the word of Moses: and there fell of the people that day about three thousand men.
How does 3000 in Exodus become 23,000 in I Corinthians? Did Paul actually study with Gamaliel? Was his memory poor? Did someone add a passage later to a letter Paul wrote? Did Paul get it right but someone copied it wrong and then people kept copying the error? I have no idea.