Kim's statements with regard to what took place with Mangum arriving at the house, in the house, and leaving the house are pretty consistent throughout. There are no blatant and obvious lies there whatsoever. When witnesses give statements of their own step-by-step movements over a period of time (of more than about ten minutes) and their observations of others' step-by-step movements to the extent they know and those movements involve different people moving about in connected locations and doing and saying different things, it is much more common for them to inadvertently leave something out and later correct it than it is for them to get it letter-perfect the first time. In fact, letter-perfect with no corrections is suspicious. That's the main reason why witnesses are interviewed more than once. To clarify and fill in the gaps after the investigator has had a chance to "map" the statement. This process may be repeated several times until the picture of movements, events and conversations is complete. At that point, if it's an important witness, they may come in for a recorded interview or sworn statement.
What I just noticed that Kim said that I was unaware of before is that she said she found none of Mangum's things in the bathroom. If a violent rape had just occurred there, since Mangum would have had her belongings with her at the time, they would have been scattered about the floor, unless Liefong wants to contend that these very drunken but highyly functional and astute criminals had already picked up the evidence from the bathroom in the moments Mangum went to the car to leave (since Mangum said nothing about falling down the stairs, as far as I know) because they clairvoyantly knew that Kim was about to return to look for Mangum's things.