Saying you lost a game on a bad spot of the ball by an official is a pretty slender reed to grab on to. Spotting the ball involves a lot of guesswork by the officials.
For example, running back plows into stacked up defensive line. 18 bodies collide in a small area. Then one official standing about 20 yards from the play runs in, points to a spot and says “He was stopped right there.”
And everyone accepts.
Unless the bad spot Gifford was talking about was an egregious error (like a player stepping out of bounds), I think he should just forget about it and move on.
The play Gifford complains about was a tackle made by Gino Marchetti a foot short of a first down that forced the Giants to punt and gave the Colts the opportunity to drive down the field to tie the game and send it to OT.
Gifford fumbled twice in the game, so perhaps he’s still a bit upset.