When teleported back a second time to the alien planet, Mike and Laura wear the same clothes and hairdo as in the first. When they are teleported to the Earth-like planet with the other combatants, they have the same clothes as the second day.
At 49:51 when another camera takes over, the white towel jumps from Laura Hanley's right hand to her left hand.
Without having heard or having it mentioned beforehand, Laura Hanley (Nancy Malone) correctly calls Benson (Nick Adams) by his first name 'Mike.'
When the alien throws the boomerang, strings or wires that guide it can be seen.
The apes come from a primitive culture, yet their boomerang has perfect blades that were obviously cut by an advanced machine.