Deliberate mistake: When Cochran sabotages the Jet Ranger helicopter by loosening the nut on the bolt securing the linear actuator governor, the bolt is inserted in the wrong direction. The bolt should have been heads up to prevent it from falling out as it did causing the helicopter to crash. Moreover, the linear actuator is on the opposite of the engine from where Cochran disconnected it. (00:38:05)
Plot hole: Apart from the impressive pyrotechnics, what is the point of destroying the Blue Thunder helicopter? By far the most expensive, time consuming and technically complex part of producing any aircraft is the design and development phase - once the prototype is in the air production is relatively straightforward. The bad guys can make new Blue Thunders any time they like, and Murphy has destroyed the only evidence he has that there was a criminal conspiracy behind the whole programme - the 'videotape' he has of blurry, false coloured characters will convince nobody. Without the helicopter to back him up that tape is of no value to him.
Col. F.E. Cochrane: You threatening me, Murphy?
Frank Murphy: No, I'm telling you. Back off.
Trivia: The registration number N77GH is visible on a gold placard on right surveillance camera' but only civilian aircraft are given November numbers. Military helicopters only have a series of numbers like on the tail. You aren't supposed to notice Blue Thunder's real "N" number, but it is there throughout the movie making it known it was truly a civilian helicopter.
Question: Why didn't Murphy tell his boss about Cochrane's plan to kill him? He tries to when he gets back, but notices some strange behaviour and walks off. Is it because he (a) doesn't trust the department and thinks the boss is in on it (b) doesn't think he will believe him (since Lymangood hid the proof) (c) decides to deal with it himself (d) just the writers' way of advancing the plot.
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