Contradiction with Luke 22:43
This verse mentions an angel strengthening Jesus in the garden, not mentioned in John 18:1.
Luke 22:43: And there appeared an angel unto him from heaven, strengthening him.
Contradiction with Mark 14:32
States Jesus and his disciples went to Gethsemane, while John 18:1 refers to "the brook Cedron."
Mark 14:32: And they came to a place which was named Gethsemane: and he saith to his disciples, Sit ye here, while I shall pray.
Contradiction with Matthew 26:36
Unlike John 18:1, which omits the garden's name, this verse identifies it as Gethsemane.
Matthew 26:36: Then cometh Jesus with them unto a place called Gethsemane, and saith unto the disciples, Sit ye here, while I go and pray yonder.