Metron's skates disappear as he pole-vaults over the fence to get into the Aqua Bunker, then they re-appear as he lands
After everybody makes the impossible jump over the broken bridge, the first pursuing motorcycle slides sideways, and the rider is in the seat; when the second motorcycle hits the first, the rider of the first is nowhere in sight.
Daniel's shirt collar is on/off his shoulder between shots throughout the movie.
When the group gets to Aqua Bunker through some water pipes, there is already lots of roller skate tracks on the dusty ground from previous takes.
As the credits roll, the Solarbabies are swimming in the surf. There is a cut to Darstar standing on a rock, taking off his shirt and diving in to the water. In the cut, all 7 of them are splashing in a circle and there are no rocks anywhere near them.
When Ivor is leading Darstar to meet Canis in the old funhouse, you can see the eyes blink and mouth twitch of an actor who is supposed to be a wax figure hangman.
Why does "Gavial" just vanish from the movie, following the RED ALERT/EVACUATE signal at the Aqua Bunker? The picture seems to suggest that he escapes, but this is never substantiated; Gavial simply flees the control room and never reappears.
Where did "Terra" get that book about rainstorms? And what convinced her that it's not mere "fiction?"
How did "Greentree" and his people get that map to the Aqua Bunker? And, since he clearly doesn't have plans to storm the Bunker (as opposed to the Solarbabies), why would Greentree keep something he had no intention of ever using?