Constant AA impact audio in Spectator mode.
Random missing ground target indicators.
Bomber Seeking Missile Heavy bots.
Random flak/AA hits while literally multiple kilometers from the nearest thing that could potentially hit you.
Flak RNG sometimes causing all flak to burst in a tight line immediately on approach instead of spaced apart.
Non-registering derp/sniper gun hits that just disappear.
ADA becoming near-invincible at Squall Line.
Excessive bad rolls (2,6,12,16) on Calibration, system seems to ensure same $$$ spent rather than actual Random rolls.
RNG on bot tailgunners with about 80% chance of engine/pilot crit on their first hit.
Bot tailgunners being invulnerable to crits.
Random failure of tailgunner firing when switching to/from tailgunner view.
Excessive tailgunner arc blocking on a bunch of planes while others with similar gun/tail config get none. (would be perhaps acceptable if it was on planes with excessively strong tailgunners but its the already weak that get excessive blocking)
Tailgunner immediately returning aim towards centre-rear the instant a target leaves its fire zone/range regardless of where the manual aim point is.
All these & more.
Many may infact be intentional design decisions & perhaps acceptable if thats the case but absent documentation of that I presume them to be bugs.