Exactly, I'm convinced that the producer/consultant conversation goes something like this;
Consultant = "These planes are too fast, their speed needs to be cut in half to better reflect the true characteristics of aircraft flown during this period."
Producer = "GREAT suggestion, we'll get right on that, and here is a check for your services, thanks for coming in!"
Consultant = "Gee thanks, it was great working with your team." [walks to exit]
Producer [to Director] = "Don't change a damn thing, the faster they are the cooler they are and the audience won't care anyway. Oh, and punch up that love story, too much war stuff is a real downer!"