In Chapter: 1, the scene of Ace Drummond's plane crashing into the monastery wall is repeated again in Chapter: 13, when the villain crashes into the same spot of the monastery wall. The villain is flying a white plane, but crashes in a black plane.
Chapter three: A Holstein cow in Mongolia.
China Clipper seaplanes are shown going to Mongolia, which has no lakes or rivers to land on.
In Chapter One, Peggy Trainor escapes in a car. As she accelerates away, the camera and several crew members are reflected in the car's rear side window.
In Chapter 13 finale, when the Dragon crashes his plane into the monastery wall as he is trying to escape, the plane he is flying is a white International Airways plane, the plane hitting the monastery wall is a dark plane with no airline logo at all.
In Chapter 13 finale, when the Ace crashes his International Airways plane after being "shot", he commanders a second plane out of the International Airways hangar which is dark and has no International Airways, or any other, logo. In the next scene Ace is climbing into a white International Airways plane and flys off.
Crosses can be seen at the Mongolian monastery.