When Danny sets up his rocket, the asphalt is dry. When he walks away to launch, the asphalt is wet.
The door of Danny's garage is shown to be closed, and a white Dodge Ram van is sitting out front, yet in a subsequent interior shot of Danny and Steve conversing, the door is raised, and there is a dark-colored sedan parked in the driveway.
Brunner tosses the flask of explosives-tincture into a huge ragged pit dug out of the earth, yet the patch of burning chemicals is on a broad flat patch of ground.
When Steve jumps from the building with Danny on his back, he is obviously carrying a dummy (the legs are only about fourteen inches long apiece).
When Steve "apprehends" Brunner saying "I'm impounding your trailer and your car", his mouth movements do not match what we hear.
Dr. Monica does not mention salt as one of the possible ingredients of peanut butter.
Dr. Monica does not ask Danny what kind of peanut butter he ate --- salted, unsalted, all-natural, etc. So Dr. Monica could not know enough about it to state which chemical compounds might have been present to contaminate the rocket fuel mixture.