Are they in the exact same spot for multiple frames?
Same location, multiple frames, but there is variation (of this white feature) between frames.
Right now this Extra Whiteness marker occurs in:
Starkiller - Reel Change 4_5 & 5_6 (the other change points have the brown thing)
PuggoKrig - Reel Change 5_6
*EDIT*
Reading the wiki entry on 'Cue_mark's: http://en.wikipedia.org/wiki/Cue_mark
an 'unverified' tidbit about the 'restored' SW. Which I guess means SE.
In the days of Three-Strip Technicolor, and successive exposure Technicolor cartoons, where separate silver images were available, it was not uncommon to apply two punches, one being larger and circular and the other being smaller and "serrated", with these being done in contrasting colors. In perhaps an homage to Three-Strip Technicolor, when "Star Wars" was restored, its conventional circular cues were replaced by "serrated" Technicolor-type cues on selected reels by the restorer.
*EDIT*
Going off of the suggestion in the next post:
~ Remember, the cue is elliptical because it got stretched
~by the lens, too. It's actually a "star" shape. Cues
~on old Disney animation used to be that way, too (I recall
~seeing such cues on FANTASIA in 1990).
The "Star" cues were unique to Technicolor prints. They were usually
magenta in color as they were etched into the magenta (of YCM renown)
record.