Contradiction with Deuteronomy 29:29
It states that the secret things belong to God, while Daniel 2:26 implies human ability to explain divine mysteries.
Deuteronomy 29:29: The secret [things belong] unto the LORD our God: but those [things which are] revealed [belong] unto us and to our children for ever, that [we] may do all the words of this law.
Contradiction with Ecclesiastes 8:17
Indicates that no one can know the works of God fully, contrary to Daniel 2:26, where understanding of the dream is sought from Daniel.
Ecclesiastes 8:17: Then I beheld all the work of God, that a man cannot find out the work that is done under the sun: because though a man labour to seek [it] out, yet he shall not find [it]; yea further; though a wise [man] think to know [it], yet shall he not be able to find [it].