When Beth sees her daughter for the last time, dropping her off for the Aruba trip, Natalee is pulling a mid-size roller suitcase. But later, in Aruba, it appears that Natalee's only luggage is a knapsack.
When Joran is in the car with Patrick van der Eem, we see a Land Rover Freelander in the movie. In reality, the car Patrick used when talking to Joran using hidden cameras, is a Range Rover.