Technically it were the Middle Guard who had advanced on the Allied position in the first place with one or two battalions of the Old, the proper Old Guard was the 1er Chasseurs and 1er Grenadiers, the 2e Grenadiers and Chasseurs were also a part of the Old Guard. A battalion of the 2e Grenadiers and another of the 2e Chasseurs were at Planchenoit while the 1er Chasseurs were guarding the Le Cailou farm.
When the French army disintegrated, the remaining squares of the Old Guard formed square and marched off the battlefield in good order, the most notable squares were of the 1er Grenadiers who fought off repeated attacks of allied cavalry and Napoleon himself was inside one of these squares, as for this scene from Waterloo I believe its supposed to show the sacrifice of the Middle Guard, though all those batteries are completely inaccurate many of the Middle Guard squares who had fallen back from the Allied ridge formed again and formed a weak defence against the now advancing allies, many soldiers of the Middle Guard died then, and it was Cambronne who Allegedly shouted Merde! or La Garde meurt mes ne se rend pas! however he later denied saying either of these words. And in fact Cambronne did surrender to the allies after he was captured in the square he was in, quite a few other Guard Generals were also captured.
But yeah, that scene is definitely inaccurate to what actually happened.
