If you don't know why it is important that the bible not have contradictions, then this may be a waste of time. Do you really want to know why, or is it important that you cling to your opinion regardless of the facts?
Exodus 2:18 - "When they returned to their father Reuel"
Exodus 3:1 - "Meanwhile Moses was tending the flock of his father-in-law Jethro"
How did Moses' father-in-law's name change in three paragraphs?
You can point out numerous "contradictions", if they must be called that. However, instead of looking at these as making the Bible "less than perfect", they are simply differences that come from separate writers who are recording traditions that have been passed down for hundreds of years.
I hope that people can understand that these contradictions do not at all diminish the the beauty, importance and life-giving value of God's Word. It in fact makes it deeper in that it can change and be adaptable to different people depending upon their circumstances and background.