When Kesslee orders his soldier to walk across broken glass, Kesslee is wearing shoes. When he walks across the glass himself, his feet are bare.
Throughout the film, especially in close-ups, Tank girl's eyes change from one green eye and one blue eye to two blue eyes.
When the Rippers first capture Tank Girl and Jet Girl, Tank Girl's wrists are strapped together. During the ensuing action, her wrists are briefly untied before being strapped together again.
When Tank Girl and Jet Girl are hiding out with the Rippers, all of the Rippers have large, kangaroo-like feet. In the final battle scenes, they're all wearing normal, human-sized shoes. During the cartoon ending, Booga has large, kangaroo-like feet.
Sam's clothes are dry 2 minutes after she is dragged out of the water pipe.
The human body is 65% water, so a person would not noticeably deflate when slightly more than a pint was siphoned away. Such a small amount probably wouldn't even be fatal.
At the prison, Tank Girl says that she doesn't want to miss "Baywatch". And later she says to Jet Girl that both of them can go to New York and see the musical "Cats". In the year 2033, both Baywatch and Cats will be very much outdated.
Near the end, when Rebecca and Kesslee are fighting, she kicks him off the platform. When he lands with his cybernetic arm trapped in the gear, his real hand is visible through a large gap in the fake hand.
When Booga and Tank Girl are lying in bed together, the right sleeve of Booga's shirt is pulled up higher than the prosthetic kangaroo arm, clearly showing the actor's elbow.
When Rebecca lights her cigarette off the flare in a dead guy's mouth after the Ripper fight, a car drives off in the left upper background.
At 1:29, during the battle at Water and Power, the safety harnesses and wires used by the stunt actors can be seen several times.
In the final fight, as the Rippers leap up and throw opponents from scaffolding and equipment, support wires are clearly visible, attached to their backs.
Camera cars and bikes are visible when Tank Girl para-glides off The Tank, even though the road is supposed to be empty.
When Water and Power capture Rebecca, Kesslee asks how many of his men she killed. The captain says 8. She actually killed 9: 1 with the grenades, 2 just after that, 3 by the bridge bit of her home (2 on it, 1 under), 2 more when the Water and Power plane landed, and one after the 'oil change' scene.