Contradiction with Matthew 21:7
In Matthew 21:7, both the colt and the donkey are mentioned as part of the triumphal entry, whereas Mark 11:7 only mentions the colt.
Matthew 21:7: And brought the ass, and the colt, and put on them their clothes, and they set [him] thereon.
Contradiction with Luke 19:35
Similar to Mark, Luke 19:35 mentions the colt but specifies that no man had ever ridden it, emphasizing its unbroken nature; this might slightly differ in interpretation.
Luke 19:35: And they brought him to Jesus: and they cast their garments upon the colt, and they set Jesus thereon.
Contradiction with John 12:14
John's account simplifies the event by saying Jesus found a young donkey, differing in details from Mark's specific account of the colt scenario.
John 12:14: And Jesus, when he had found a young ass, sat thereon; as it is written,