Factual error: While the problem with refuelling the SR71 is a real one for D.A.R.Y.L., he is never going to get that far. The SR71 had no self starters and required a trained crew with a starter generator mounted on a truck to get the engines going in the first place. D.A.R.Y.L. just pushes a button and away he goes. Not likely.
Factual error: DARYL steals an SR-71 Blackbird reconnaissance plane toward the end of the film. Conceding the absurd notion that a kid could fly it (computer brain or not), the problem is that SR-71 requires an in-the-air refueling shortly after attaining low cruising altitude. This is because the fuel tanks are designed to leak on the ground - the friction of high speed flight expands and seals them - and the afterburners required to get the plane up guzzle fuel. DARYL would have run out of fuel long before his flight ended, and the Air Force did not send up a tanker for him.