Slick is following Annie in his Jeep. When he asks her a question, she is wearing a pink shirt, but when she answers him, she is wearing a red swimsuit under her clothes.
When swimming with dolphins, Annie is sometimes shown wearing a mask, which disappears and reappears between shots.
When Annie is inside the plane, there is nothing hanging on the wall. A few seconds later, there are two bags hanging from it.
Annie is lying down, as if knocked over, inside the underwater plane *before* the explosion caused it to shake.
The helicopter the Evermans are flying in at the beginning has two flotation pods and is white with a black tail. The helicopter they are shown leaving on the ground has ordinary skids and has large blue stripes on the fuselage.
When the ship sinks and everyone ends up in the sea, the studio tank is clearly visible from behind.
When Slick first meets the family he is wearing a vintage WWII-era Army officers cap. Yet by the time they arrive in town this has switched to a vintage WWII-era Naval officers cap. As he was driving the jeep he could not have changed hats.