This shows the first 'chunk change' in ANH.
The top waveform is third reel of cinema dts.

Bottom is schorman's AC3 rip from a North American laserdisc.
I've raised the speed from NTSC to film (48048 --> 44100)
The jagged portion at the left is the sound of Alderaxis exploding.
Toward the right is seen the hummm of Luke's green saber.

The grey box represent what's missing from the LD.
Would need to insert that much into the LD in order to match the cinema,
(or cut that much from dts to match extant video sources.)
Gray box is 4.4 frames in duration, or eleven fields in the NTSC video realm.

This next picture represents the same thing.
Frame numbers in column DARKSVN is an LD preservation, same catalog number as schorman's.
As before the grey box show eleven fields which I've inserted into the LD:

Two consectutive 3's (C10 & C11) isn't necessarily impossible but it shouldn't be that way, you wouldn't think.
Was the reel physically cut, then run through the telecine machine in two passes?
Well it's all wild-ass-guessin' at that point...