fran,
The immigration document is legitimate- it is not a forgery. Beth went through customs at 7:45, which means she probably arrived there at app. 7:00. Why she has said consistently that she arrived at 11:00 is something for her to explain. Btw, there is an employee at the airport who has verified the earlier arrival time.
As for the students, please provide an example of one of them testifying to Natalee getting in the car. Yes, everyone (last night, the "Dateline" special repeated this, again without any examples) maintains that "Natalee was seen" entering the car, but the individual statements do not reflect this. I realize Joran and the Kalpoes admitted being in the car with her, but as you know, there was initially some doubt as to whether or not they even knew who Natalee was, or were confusing her with another blonde.
That doesn't mean I necessarily doubt that Natalee got into a car with them, but it does seem very strange that none of her friends were willing to go on the record, individually, about actually witnessing it. Of course, this hasn't stopped Beth and company, or any mainstream journalist, from declaring that they did.
I think there are a myriad of disturbing questions in both of these cases.