The image of the single-engine plane carrying Ahern's "boys" appears empty except for the pilot.
When Bugs Ahearn practices polo for the first time, there is an echo audible, although he is outside on a field (a clear indication that the scene was shot in a studio).
Thefirst shot of Ahearn's yacht clearly shows a scale model.
The single-engine plane that Ahern's boys fly out to California in would be vastly over-loaded with that many large men in especially with all the weapons they've brought along.