Contradiction with Jeremiah 1:7
Contradiction lies in God directing Jeremiah to go and speak, whereas Jeremiah 36:6 involves someone else (Baruch) reading Jeremiah's words.
Jeremiah 1:7: But the LORD said unto me, Say not, I [am] a child: for thou shalt go to all that I shall send thee, and whatsoever I command thee thou shalt speak.
Contradiction with Exodus 4:10
Contradiction in Moses citing his own speech difficulties, unlike Jeremiah 36:6 where Jeremiah instructs Baruch to speak on his behalf.
Exodus 4:10: And Moses said unto the LORD, O my Lord, I [am] not eloquent, neither heretofore, nor since thou hast spoken unto thy servant: but I [am] slow of speech, and of a slow tongue. [eloquent: Heb. a man of words] [heretofore: Heb. since yesterday, nor since the third day]
Contradiction with Matthew 28:19
This verse commands to go and teach all nations, contrasting Jeremiah 36:6 where the task is passed on to another, not fulfilled by Jeremiah himself.
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 1 Corinthians 14:28
Contradiction on communication; while Jeremiah relies on another to convey his message, this verse advises remaining silent if not direct.
1 Corinthians 14:28: But if there be no interpreter, let him keep silence in the church; and let him speak to himself, and to God.