Such as there being no evidence in Egyptian writings that the Hebrews were ever enslaved, or that 10 plagues occurred?
Well, that does'nt concern me too much. Many of the Pharaohs that we know about have left no evidence of their existence beyond their name written on their kid's or grandkid's tomb that has been terribly desecrated.
It is also unlikely that the Pharaoh upon whose watch the events in Exodus took place, was eager to have that memorialized or otherwise enscrolled. Call it the "Sir Robin's Minstrels Effect". If you've ever seen that flick, If you have'nt, call it the "LBJ Effect". Or the "Jimmy Carter Effect". ;-)