First off: when sitting at a field with ack lethality turned down, I noticed that the Spitfire doesn't get
any bullet holes in its fuselage at all.
When looking through the gunsight at bullet holes in the canopy, they are not visible.
There is a transparency issue that the bullet holes in the canopy are visible through the fuselage.
No damage appears when trying to view it through the canopy.
All these bugs appear in the Spitfire I (except the transparency issues are limited to the areas around the back of the canopy for the Mk I), so I assume they're generic for all the Spitfires. Also, I noticed that some bullet holes appear in odd areas, such as suspended in mid air in the gear well.
On another note, I noticed this transparency issue with the carrier's deck, its wake and a crashed plane.