As filmed/edited/shown, the 'climactic' end chase makes no spatial sense, giving a very strong impression that the chased and chasers were filmed separately and loosely edited together.
The glowing alien eyes are overlaid images, apparent when they move separately from the heads directly behind them.
Janet's exit at 7:30 reveals the flimsiness of the stage walls.
When the show begins, Ikar walks through the gates without their having been opened. Later in Eric's car when Ikar starts to get out, he opens the door as a human would.
At 42:00, the camera filming Ikar's vanishing jiggles slightly. The effect is worse, sloppy, at 47:43 when two enforces should disappear smoothly but can't because the camera had moved..
If looked for, one can spot the cable at the roots that lifts the tree the enforcer raises at 46:35.
Ikar says his planet is overpopulated, but if its females serve only for reproduction, and its society is perfectly organized, how could it become overpopulated?