During an escape sequence at the end of the film, the British scientist's thin beard begins to peel off.
When Krankor's ship returns to Earth the morning after the first confrontation, a bird is perched on top of the spinning periscope. In the close-up, the bird flies away from the periscope.
The wires suspending the space ships are frequently visible.
Krankor is allowed to escape after he threatens to kill a boy. As he starts running up the stairs, the boy (who is standing next to him) starts following him up the stairs, realizes he's supposed to stay where he is, and stops.
A gravestone knocked over in the cemetery is clearly a hollow prop.
Prince of Space claims the enemies' weapons have no effect on him, yet he flinches and tries to avoid their fire when he is fired upon.
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