The differences between the R2-D2's in my collection are tricky to spot! Two of the differences might be unintentional because they were perhaps produced by defects in the manufacturing process and hence may not be found on every minifigure. The other difference, which is between the earliest and later R2-D2s is not a manufacturing defect.
In my collection there are 3 R2-D2's. The earliest comes from the Droid Escape set #7106, released in 2001 and belongs to the New Hope series. Also belonging to the New Hope series is the second R2-D2 that came from the Limited Edition X-Wing Fighter set #6212, released in 2006. The third R2-D2 comes from Anakin's Jedi Starfighter set #7669, released in 2008 and belongs to the Clone Wars series.
|R2-D2 & 3CP0 from 7106 set.|
|Backsides: 6212 R2-D2 (left) & 7106 R2-D2 (right)|
Differences: The earliest R2-D2 from the 7106 set has a circle instead of a dot on the back of it's dome head, which is sported on both the later versions. The circle is located within a small rectangle that is to the left of a black eye looking shape (see photo).
|R2D2 & Anakin from 7669 set.|
The Clone Wars (7669) R2-D2 differs from the X-Wing (6212) R2-D2 in that the 7669 minifigure has a blue print within the silver area on the dome, and has a small dot between two larger dots above the rectangle on the back of the dome (same rectangle discussed above). The small dot mentioned here on the 7669 R2-D2 may be unintentional and produced from a manufacturing glitch because the dot is quite small, however the difference in coloring is less likely to be a manufacturing glitch because it is a more
|Backside of R2D2 from 7669 set.|
noticeable difference; feel free to disagree with my logic on this one.