And msycamore is correct: they're not apparent on JSC, but that doesn't really prove anything for certain.

Also not on the CED.

(http://noneinc.com/tteesstt/SW_2FrameGlitch/SW_2FrameGlitch-CED_2.jpg)

*Speculation* but this CED was an outdated format by the time they released anything and the JSC was released towards the end of the laserdisc run, would LFL have thrown a lesser 'master' copy for these home releases which they were probably financial obligated to do but not fully behind? or were CED's produced in Japan and that's a possible connection for a different master being used...

http://www.cedmagic.com/featured/star-wars.html

This page says they were pressed in Carrollton, Georgia, so theory 2 is crap....

...and you went to Disneyland and were not "raped" and/or "killed", you might not be SERIOUS enough with your preservation activities.