Contradiction with James 1:19
James advises to be "swift to hear, slow to speak," whereas Acts 2:14 shows Peter immediately speaking up and addressing the crowd.
James 1:19: Wherefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath:
Contradiction with Proverbs 10:19
This verse suggests that in many words sin is not lacking, contrasting with Peter's lengthy address in Acts 2:14 and following.
Proverbs 10:19: In the multitude of words there wanteth not sin: but he that refraineth his lips [is] wise.
Contradiction with Ecclesiastes 5:2
Advises not to be quick with words before God, but Peter in Acts 2:14 quickly speaks and addresses the multitude right after the outpouring of the Holy Spirit.
Ecclesiastes 5:2: Be not rash with thy mouth, and let not thine heart be hasty to utter [any] thing before God: for God [is] in heaven, and thou upon earth: therefore let thy words be few. [thing: or, word]
Contradiction with 1 Corinthians 14:34-35
Advises women to keep silent in churches, contrasting with Peter addressing the entire assembly, including women in Acts 2:14.
1 Corinthians 14:34-35: Let your women keep silence in the churches: for it is not permitted unto them to speak; but [they are commanded] to be under obedience, as also saith the law.