Contradiction with Exodus 20:9-10
Mark 2:4 describes performing an act on the Sabbath, while Exodus 20:9-10 commands rest on the Sabbath.
Exodus 20:9-10: Six days shalt thou labour, and do all thy work:
Contradiction with Matthew 12:12
Mark 2:4 demonstrates removing a roof to achieve healing, whereas Matthew 12:12 implies it is lawful to do good on the Sabbath, but within different contexts of necessity.
Matthew 12:12: How much then is a man better than a sheep? Wherefore it is lawful to do well on the sabbath days.
Contradiction with Luke 10:40
Mark 2:4 shows the friends overcoming obstacles to help, contradicting Luke 10:40 where Martha asks for help with tasks.
Luke 10:40: But Martha was cumbered about much serving, and came to him, and said, Lord, dost thou not care that my sister hath left me to serve alone? bid her therefore that she help me.