Continuity mistake: It's shown in many scenes that the robot Gallaxar sends isn't particularly quick moving when it walks. But when it's chasing Ginormica around the city, even though Ginormica is sprinting away, it can catch her far more quickly than its speed would allow. It doesn't suddenly speed up - in the shots when the camera focuses on the robot again, you can still see it moving slowly.
Monsters vs Aliens (2009)
Ending / spoiler
Directed by: Conrad Vernon, Rob Letterman
Starring: Kiefer Sutherland, Reese Witherspoon, Seth Rogen, Hugh Laurie, Will Arnett
Galaxhar(Rainn Wilson) captures Susan(Reese Witherspoon) and drains the Quantonium from her, making her small again. The Missing Link(Will Arnett), B.O.B.(Seth Rogen), and Dr. Cockroach(Hugh Laurie) get into the ship and free Susan. They manage to hack into the spaceship's computer and set the ship for self-destruct. This causes the ship to lockdown, seperating Susan from the other monsters. She breaks into the control room and fights Galaxhar. Galaxhar tells Susan that he can't override the lockdown and can't free the monsters. Susan sees that Galaxhar has drained the Quantonium into a glass ball and knocks it loose so that it lands right on her. Susan becomes giant again and saves the monsters. They escape the ship before it blows up, courtesy of Insectosaurus, who has sprouted wings, like a butterfly. General W.R. Monger(Kiefer Sutherland) tells the monsters that there is a monster terrorizing Paris. They all get on Insectosaurus' back and fly off....
moviedragon
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Dr. Cockroach, Ph.D.: I'm not a quack. I'm a mad scientist.
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Chosen answer: Well, it's a fiction movie; some suspension of disbelief is always needed. There could be a number of explanations: for instance, lifeforms such as insects on the grass, bacteria inside them or even grass itself, being unable to absorb quantonium. It might affect only sentient beings. Or Susan might even be the first being to get in contact with the substance - this would be possible depending on the shape of the meteorite container, the exact means by which quantonium touches her body - which isn't shown... but, first and foremost, this happens because its not happening would leave the filmmakers with a plot issue to be dealt with - so, other beings don't grow simply because they don't.