Copied from: Jews for Judaism
There are also numerous contradictions in the New Testament book of Acts. In chapter 7:51, we are told that the disciple Stephen is “full of the Holy Spirit.”  However, when recounting basic Jewish history, this spirit is non-existent because he [the spirit] contradicts well-known, undisputed facts clearly stated in the Old Testament.
Every child who reads a Passover Haggadah knows that the Jews went down to Egypt as a group comprised of 70 people and subsequently became a great nation. This statement appears in the Old Testament in three places. “Your fathers went down to Egypt seventy persons in all.” [Deuteronomy 10:22, Exodus 1:5, Genesis 46:27]
It is inconceivable that Stephen, a person described as “full of the Holy Spirit”, would mistakenly state, “…and Joseph sent word and invited Jacob his father and all his relatives to come to him, seventy‑five persons in all.” [Act 7:14] Moreover, Stephen continues to recount incorrect biblical facts when he states that “Jacob went down to Egypt and there he and our fathers died. From there they were removed to Shechem and laid in the tomb which Abraham had purchased for a sum of money from the sons of Hamor in Shechem.” [Acts 7:16]
in a cave purchased by Abraham from Hamor. In truth, Jacob was buried in Hebron in a cave bought by Abraham from Ephron. “For his sons carried him (Jacob) into the land of Canaan, and buried him in the cave of the field of Machpelah,  the field that Abraham bought as a burial plot from Ephron…” [Genesis 50:13]
Once again, we see that Stephen was obviously not filled with divine inspiration when he got his basic facts confused. In fact, it was Joseph who was buried in Shechem [Joshua 24:32] in a field purchased by Jacob from Emmor. [Genesis 33:19]