Contradiction with Deuteronomy 29:29
This verse states that secret things belong to God, while Revelation 5:1 portrays a sealed book meant to be revealed.
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 Matthew 24:36
This verse indicates that no one knows the day or hour of the future, whereas Revelation 5:1 suggests a revelation of future events through the sealed book.
Matthew 24:36: But of that day and hour knoweth no [man], no, not the angels of heaven, but my Father only.
Contradiction with Isaiah 46:10
This verse asserts that God declares the end from the beginning, which seems contradictory to Revelation 5:1, where events are sealed in a book requiring revealing.
Isaiah 46:10: Declaring the end from the beginning, and from ancient times [the things] that are not [yet] done, saying, My counsel shall stand, and I will do all my pleasure:
Contradiction with Mark 13:32
This verse mentions that not even the Son knows the timing of the end, contrasting with Revelation 5:1's implication of future knowledge being contained in the scroll.
Mark 13:32: But of that day and [that] hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father.