When Sandra and Hugh are trying to get to the RV, a door opens and Sandra slips. She stands up with the help of Hugh and her skirt is completely clean. But in the next shot there is dirt on her skirt, supposedly from falling.
In the trailers (on the radio in the UK, anyway), there's a bit with Hugh Grant saying something like "This is no job for a grown up - drinking without being responsible...actually, it doesn't sound that bad". This was never in the finished film.