Corrected entry: When Jimmy, Carl, and Sheen travel back to the present, why are they in a hurry? They didn't know the Copbot travelled back to the present. And how did the Copbot know where to even find them?
The Evil Beneath/Carl Weezer, Boy Genius - S3-E13
Plot hole: In "The Evil Beneath", after Jimmy, Carl, and Sheen escape Dr. Moist's secret lair, they fly back in the hover car where they start seeing some evil fog shadows, and take off. Earlier, being out of fuel was the cause of the hover car's crash landing, but somehow it's been refilled to escape.
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Suggested correction: The hover car's crash landing was due to engine failure, not being out of fuel.
Correction: They were in a hurry to find the megalomanium and destroy it before Libby could use it on herself.