'We lost hydraulics in one engine'
MISTAKE. The variant they are flying is the B-17F, and early version of the -G. The -G is distinguishable because of its nose turret, which this one did not have. It was slightly more advanced than the -F. It had all the major improvements the plane ever received, therefore, the B-17F DID NOT have hydraulics in the engines. The only hydraulics on the B-17G were the cowl flaps and brakes. All else was electric, with several exceptions...SOME chin turrets had hydraulic gun chargers, along with the Sperry gun Turrets, both top and bottom, were hydraulically actuated by an electric 28V DC double ended motor, that drove the self-contained hydraulic Vickers (two) wobble pumps..one for elevation and the other for traversing....a wobble pump rotor rotates and is at an angle so that the several cylinders in turn pushed in/out and thus create pressure.
My father was a copilot on a B-17G, 44-6465- the Fancy Nancy, accomplishing 36 missions in '44 and '45.
So that's just a minor mistake (but it stood out to me), but overall, considering it has a smaller budget than most Hollyweird WW2 plane movies, it was enjoyable.