The film viewer shows more 30mm hits than actually happen.
With all the internet problems I think we probably all break even as far as things going wrong in game (that are internet related). Some anomalies work in our favor and some against. We tend to only remember the things that go against us.
I had read in an earlier posting the film viewer could go slightly out of sync and change things up one way or the other. I have experienced something like this after a few times shuttling back and forth in the same film. Now I mark down the elapsed time, and then close and re-open the viewer and go straight to just before the point I want to see. Then all seems in sync again.
Because the 30mm makes a fireball, it's easier for me to see 30mm hits even in fleeting glimpses during play. For a long time, I thought planes were catching fire only to look back puzzled to not see fire. Looking at the films is how I learned about the fireball from 30mm hits.
While watching films, noticed some things that I could be wrong about:
1) The bomb bay doors appear to be indestructible and might even act as shields.
2) When the bombers are firing back the damage to them appears to be less than if they aren't.
3) Once parts detach from the bomber they inflict no damage to the bomber or other planes.