In the hangar, the gun choices are identical.
Fuel gauge has writing vertically displayed and larger than it should be.
Turn coordinator needle drops from default position in left turns.
At one point, when flying in the general direction of the sun (maybe 5-10 degrees off heading directly at the sun), the artificial horizon would light up when doing turns. I was unable to duplicate this in other attempts. Didn't change anything during flights.
Turn coordinator and lit up artificial horizon
Back to normal, note the heading doesn't change much
Cannon muzzle flashes through instrument panel.
No muzzle flash in external views for cannons or MGs.
No tracer smoke from outboard cannons in internal view.
Landing gear strut pops up through wing during retraction/extension. Extra rear wheel on ground.
Some instruments visible external side views close up.