Revealing mistake: When the shark crashes in the control room and eats Fred, "Fred" is a dummy. His hand moves around in the water in an unnatural manner.
Revealing mistake: When the baby shark dies it is an obvious fake rubber shark with no movement before it died and no reaction from the watching crowd.
Revealing mistake: As Mike and Kathryn are underwater with the submarine, they pass the control room, and in the next shot, as the submarine turns around, the front of it suddenly goes transparent. (00:32:00)
Audio problem: Near the end of the film when the shark is in the control room he eats a man underwater. The man is heard to scream and cry out, and you can hear him taking breaths in between screams despite being underwater with no breathing equipment.
Revealing mistake: When the shark goes on a rampage at Sea World, whenever the fin goes above water, it is blatantly obvious that the fin is fake, and it is doubly obvious in some shots when we can see the welding line running right down the fin where the crew fused the two sides of the fin together.
Factual error: In the scene near the beginning of the film where a diver gets eaten by the shark, an unattached arm is left suspended in the water. Not one drop of blood was spilt into this water.
Revealing mistake: About two-thirds of the way through the film, there is a wide shot of Jaws swimming. Keep in mind that a shark swims by the moving of its body and tail. It's quite obvious to see that Jaws is a matted-in puppet as his tail moves only once and he is propelled a long distance. Also note the fact that the tail move is quite mechanical and not the easy motion a real shark would make, and his body doesn't move at all. The shark in Shark Attack 3: Megalodon looked better than this.
Revealing mistake: Matte lines are visible on the submarine as Mike and his girlfriend drive it through the reef.
Revealing mistake: Very obvious fake dummy when Mike and his girlfriend view the dead body.
Revealing mistake: Matte lines are visible around Jaws when he crashes into the window of the control room.
Continuity mistake: In the kitchen scene when Mike and Sean are eating breakfast, the phone cord hanging behind Mike keeps changing from being loose and free, to all twisted and tangled. (00:26:40)
Continuity mistake: In the breakfast scene, as Mike walks over to the table with the pot of coffee, the amount in the pot changes from barely full to almost full to the top as he sits down. (00:26:35)
Continuity mistake: In the breakfast scene with Mike and Sean, the angle of the Tropicana juice carton keeps changing. (00:26:10)
Revealing mistake: When Shelby's corpse shows up in a Ben Gardner like jump scare, you can tell that the hair is not attached after they made a mold of Harry Grant's chest and face and edited it.
Continuity mistake: After the big shark dies Mike and the blonde girl are calling the dolphins, in one shot it's dawn and it's dark but suddenly in the very next shot it's completely daylight.
Revealing mistake: When the shark bites the fish in half just before the opening titles you can see the back of the fish tank the shot was being filmed in.
Continuity mistake: When Mike is in the water doing the welding on the tunnel patch he is wearing a full face mask with the rebreather attached at middle, but when he and Kay are swimming away and go into the door back to the control room after being chased by Jaws, he is wearing just a regular snorkel mask with the rebreather in his mouth.
Continuity mistake: The small shark shrinks a lot when it's brought into the enclosure. If it were its original size, it would have stuck halfway out of the tank.
Factual error: Although continually referred to by the workers at the park as "he, " the captive killer whale kept there is obviously female. You can tell by the shape and size of the fin.
Continuity mistake: The size of the small shark decreases a lot when it is caught.
Answer: You are correct that he never directed another movie because Jaws 3-D underperformed financially and was a critical failure. Alves' directing style was particularly panned. As a further humiliation, Alves was nominated as 'worst director' for the 1983 Golden Raspberry Awards.
raywest ★