Visible crew/equipment: In the scene where Brody approaches the group of teenagers on their smashed boats, the angle cuts to show Brody approaching seen as if from Cable Junction. At this point, there is a huge mistake. The teenagers' boats are clearly visible in the foreground, the kids have all completely vanished, and you can spot the cameraman standing on the boats quite clearly.
Suggested correction: If it's the angle I'm thinking, I think this is wrong. The first boat to appear in that short is of Lucy and Patrick, but the positioning of the fencing joints plus the boat visible is simply the upturned Marge and Sean's boat that Sean was rescued from before this.
Revealing mistake: During the scene in the bar, the first shot shows some kid playing an arcade of some sort, and the shot continues to scroll from right to left. However, all the writing (ie. the arcade machine, t-shirts, chalkboard, and various signs) are all backwards, which means the shot is flipped.
Suggested correction: I think some of the shots from that are shot showing the mirror's reflection of the bar because shortly after the same, or immediately in the next shot, it pans down to show Lucy and Patrick, but as both them and the mirror reflection of, so I think it's slightly to do with that. Yes, to wonder why this was and whether it was intent or just an unthought error, but could have been that the reason it appears flipped than an actual editing flip mistake.
I agree, the pan is continuous, and even after it pans the other way and there's a weird cut, the camera position doesn't change. When it pans down, you see we've been looking in a mirror.
Continuity mistake: In the scene where Chief Brody comes home drunk, Deputy Hendricks comes over to express his sorrows. When he's leaving/already left, Both Ellen & Chief Brody comment on Hendricks as "Poor Jeff." In the first Jaws film, Brody calls him Lenny. Jeff is actually the first name of the actor who played Hendricks.
Suggested correction: It was a retcon from the filmmakers. Originally his name was Lenny, and then they changed it to Jeff. Same thing with The Mayor's children in the first movie. In the sequel, he only has one son; Larry Jr.
Not really a retcon, simply a mistake. Not every change, intentional or not, can be hand-waved away as a retcon.
The correction is valid. The person who submitted the mistake didn't watch the scene. They never said "poor Jeff", it was "poor Hendricks." But both Martin and Ellen call him "Jeff" in the scene and his name is said 3 times. Plus, if you read over the original script, the name "Jeff Hendricks" is mentioned 4 times.