A couple years ago for fun I dug into this run and some other great gold medal runs...I personally think Gable's '72 run is still the gold standard for U.S. dominance (and maybe '71 + '72 the two year standard).
As far as rules go then, matches were 9 minutes (3 three minute periods; aggregate scoring) and takedowns were 1 pt. Matches were not stopped early for technical superiority (only falls). Of course there were no "step-outs" and out-of-bounds was very strictly enforced (frlooked like only one point of 1 wrestler was OOB?), but as far as the pre-"step-out" era goes, I think these were about as difficult a set of conditions as one could create to go unscored upon throughout a tournament. The strict out of bounds rules also really played against Gable's strengths as he was extremely aggressive and international competition would play the edge (see finals video below).
As far as his performance goes, in 21 matches leading up to and including the Olympics, Gable racked up 12 pins (57%) and outscored opponents 130-1 in matches that didn't end by fall (14.4 pts/match). Again, 1 point TD's then and very strict out-of-bounds rules. The only person to score on him during that streak...Larry Owings... of course! (Gable won 7-1 in their OTT match).
Domestically he beat Lloyd Keaser 22-0 and 11-0 in the finals of the US Olympic Trials. And, Keaser would win World gold the next year in 1973 in Iran after Gable retired.
At the '72 Olympics, Gable had 3 pins, 1 technical superiority (21-0, I believe), and shutout decisions over Silver medalist Kikua Wada (JPN) and Bronze medalist Ruslan Ashuraliyev (USSR). Ashuraliyev would go silver-gold-gold in the next three World Championships.
Gable also dominated the World Championships as a 23 year old in 1971. He pinned his first four opponents, including Wada (see Farrell quote below), before avenging an early season Tibilisi loss to Vasilli Kasakov (USSR) with a 5-1 victory in the finals. Notably, the reigning world champ, 6x World and Olympic Champion, Abdollah Movahed (Iran) was in Gable's bracket, but knocked out in the 6th round.
From the 3/19/1972 NY Times:
Bill Farrell, United States Olympic coach, says Gable's stamina is superhuman.
“Last August in the World Games in Sofia [Bulgaria],” said Farrell, whose team finished second to the Russians there, “Dan wrestled a Japanese named’ Wads. ‘They thought he was the best in the world until Dan got hold of him. Dan just kept going at him, grabbing, pulling and handling the poor guy. Finally, Wada couldn't take it anymore, so he let himself be pinned.”
Over those 2 years Gable beat 12 Russians/Soviets.
Looks like 4 videos of Gable's matches from the 1972 run pop up here:
https://www.youtube.com/results?search_query=dan+gable+1972+olympics+