The taxi changes from an older 50's style rounded car, into a square 60-70's style as it shoots over the cliff.
When Susan falls in the quicksand, her pants end up completely dirty. In the scenes thereafter, they are clean again.
When Steve hangs his foot out of the taxi's back door, the road is fully gravel, yet when the shot moves back to show the full exterior, it's clearly tar.
Between camera shots of the alligator attack, the distance between the alligator and Susan changes randomly, and alligator-stirred ripples in the water are present/absent.
When Steve and Susan first enter the compound where her father is being held, Steve kills one of the guards (in the plaid jacket) by snapping the guard's neck, complete with bone-breaking sound effects. That same guard is mysteriously alive and well a few minutes later to escort Steve "outside" and to help lock him up for interrogation.
When Susan drops her gaze after looking up at the palm trees while riding in the motorboat, the watery cypress-fringed shore of the river is seen drifting in the wrong direction from Susan's perspective in the moving boat.
Missiles are a lot smaller and less complex than a human-carrying space-rocket, so they require a much smaller and simpler launching pad, and thus they could conceivably be launched from almost anywhere, so Steve would not have known to choose Florida as a place where missiles would likely be present. Susan had actually seen a space-rocket in her ESP visions, not a missile, so if she had correctly said that to Steve, then it certainly would have meant Florida as a likely location, since the Kennedy Space Center/Cape Canaveral is the main space-rocket-launching location in the USA.
Alligators have broad-based conical teeth with a somewhat triangular shape and fairly blunt tips, not long narrow pointy needle-sharp fangs as are shown on this creature. Obviously a cheesy-looking imitation 'gator that is grotesquely overdone in an attempt to make it look ferocious.
The young guitarist's visible strumming does not match the audible strumming sounds; occasionally there is even music when he is not even touching the strings.
When Steve is playing the guitar, his left-hand movements don't match the chord changes. In addition, as he begins to play the guitar faster (presumably at bionic speed), the pitch of the music gets much higher, but his left hand does not move up the frets of the guitar, which it would have to for the higher-pitched notes.
When the Taxi careers down the embankment there is no Taxi sign on its side. And that is not a typical taxi from Spain in the 70's. They were black with a diagonal red stripe on the front doors. Mostly Seats.
Throughout their trip in The Everglades there are many bird calls heard in the background. One specially recurring sound is the sound of a Kookaburra. It is a species of kingfisher only found in Australia and nowhere in the United States.
When fighting off the thugs around the campfire, Steve is using both arms to swing the giant log around. Obviously, only his bionic arm would have carried the weight.
Susan ESP-visualizes a NASA space-research rocket being launched by the Kennedy Space Center at Cape Canaveral, yet she speaks of it as a "missile" when describing her visions to Steve.
Susan's accent wanders throughout the episode, starting off as American and then later becoming strongly English. (actress Pamela Franklin is English).