Corrected entry: When the boat rises into the airship, you can see the wires that are pulling the boat up.
Corrected entry: Near the end of the movie when the boat is being raised out of the water to ascend to the spaceship, Steve Guttenberg jumps out of the suspended boat into the water by an inflatable raft. The camera is high and tilted down and you can see something sticking out of the water directly behind the raft. Another closer angle reveals that it is the head of a safety diver. A water level angle shows the diver quickly ducking under the surface.
Corrected entry: When the aliens take off their "human suits" in the pool house, the suits have eyes in them - they should have had empty eyeholes so that the Antareans could see while wearing their disguises.