Most movies are egregious offenders but they don't get singled out. Maybe that's because it's pedantic to look for ripoffs of superficial stuff? Or because some are not ripoffs but deliberate references (or even hommages?) Obviously we'll not agree that fixating on this misses the important stuff about this movie.
I wondered about the tail rotor. I don't know much about the basic principles of aircraft engineering but it didn't seem quite right. Now, if I rewatch, the rotor'll ouch when I see it. I'll blame you for that.
At least we agree that the visual design was not as good as it can be.