Contradiction with Isaiah 40:8
It states that "the word of our God shall stand for ever," which may be seen as a contradiction if one takes "heaven and earth" in Matthew 24:35 to symbolize enduring entities, yet they are said to pass away.
Isaiah 40:8: The grass withereth, the flower fadeth: but the word of our God shall stand for ever.
Contradiction with 2 Peter 3:10
Describes the day of the Lord where "the heavens shall pass away with a great noise," which contradicts the eternal aspect depicted in "my words shall not pass away" if interpreted as implying no lasting change.
2 Peter 3:10: But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
Contradiction with Revelation 21:1
Mentions a new heaven and a new earth, implying that the old ones would pass away, which could seem contrary if Matthew 24:35 is seen as suggesting all creation endures permanently.
Revelation 21:1: And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.