Continuity mistake: When Brody jumps from his seat to get Michael out of the sailboat, he lifts Ellen by her arms. But then, one shot later, he's lifting her by the hips instead. (00:23:35)
Continuity mistake: Throughout the movie we see a number of underwater scenes with the camera shot looking up under the swimmers where the water is very clear and blue given how many swimmers we can see from a distance. The only problem is that the water everyone is swimming in is greenish and cloudy as can be seen with the camera shots that are half in and out of the water right along side of the swimmers.
Continuity mistake: When Quint shouts for Hooper to tie up the first barrel, Hooper's grip on the electronic tracking device differs from one shot to the next. (01:24:15)
Answer: Possibly a scar from having his appendix removed, I've been told.
The appendix shot is Brody - he is feeling inferior as the other two share tales of the sea and the only scar he has is from his appendix being removed.