I knew about the missing lines, though I was unaware of the missing audio cues in the Laserdisc.
I was under the impression that the DVD 5.1 was the only mix that had such issues?
EDIT: Also, just for clarification sake, the Laserdisc in questions is below.
http://www.lddb.com/laserdisc/07067/ML100872/Fistful-of-Dynamite-A-%281971%29