On the morning of the wedding Peter sits down at the breakfast table, picks up a piece of toast, and butters it. In the next shot, the toast has no butter on it, so he butters it again.
The police officer states that Neil stole Carmen's car on "the coldest night of the year". If this film is indeed set over the coldest period of any year, there is no way Neil could have survived being left naked on a beach on an island in the north of Scotland the previous night. He would have quickly got hypothermia. He even goes into the sea more than once and suffers no ill effects.