I Know What You Did Last Summer - Wellington Boots!
Just after they run the man over, they find his Wellington. Several minutes later they carry him away...wearing TWO Wellingtons...did they put it back on his foot? I don't think so!!
It was a slipup and here's how it happened...
Julie finds the boot, realizes they ran over someone, and throws it down. Then her along with Ray, Barry, and Helen go looking for the body. They find it about 20-30 feet away from the boot. It has one boot then. Then Max comes. He's already almost passed the spot where the boot was by the time Barry and Ray pick him up, not leaving any time for anyone to go back and get the boot. But when they did pick him up there were two boots on his feet.
If you don't believe me then just watch the movie. You can see that no one ran back to get the boot or brought it with them when they found the body, so it is a slip up.