Contradiction with Genesis 3:8
While Luke 24:15 describes God walking with people, Genesis 3:8 shows Adam and Eve hiding from God's presence.
Genesis 3:8: And they heard the voice of the LORD God walking in the garden in the cool of the day: and Adam and his wife hid themselves from the presence of the LORD God amongst the trees of the garden. [cool: Heb. wind]
Contradiction with Exodus 33:20
Luke 24:15 depicts God in human form walking alongside people, but Exodus 33:20 states no one can see God's face and live.
Exodus 33:20: And he said, Thou canst not see my face: for there shall no man see me, and live.
Contradiction with John 1:18
In Luke 24:15, God is present with the disciples, whereas John 1:18 mentions that no one has seen God.
John 1:18: No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared [him].
Contradiction with Psalm 104:3
Luke 24:15 suggests a personal, grounded approach of God walking, while Psalm 104:3 presents God as dwelling above and beyond in the heavens.
Psalm 104:3: Who layeth the beams of his chambers in the waters: who maketh the clouds his chariot: who walketh upon the wings of the wind:
Contradiction with Romans 8:34
Luke 24:15 presents Jesus as physically present, whereas Romans 8:34 speaks of Christ being at the right hand of God, interceding from heaven.
Romans 8:34: Who [is] he that condemneth? [It is] Christ that died, yea rather, that is risen again, who is even at the right hand of God, who also maketh intercession for us.