I dunno how many readers of this blog will be interested in this but I figure there must be at least one…
Between 1934 and 1959, The Three Stooges made 190 short comedies for Columbia Pictures. Those were years when short comedies slowly went out of fashion in movie theaters. Laurel and Hardy, for example, stopped making them and switched over to features only in 1935 and the last short Our Gang comedy was in 1944. The Stooges kept at it by not increasing what was spent to make them. That meant they had to make them faster and cheaper each year.
One way the producers accomplished this was to reuse footage from earlier Stooges films. A lot of their shorts were simply a matter of taking an earlier film, shooting some new scenes to edit into it and giving it a new title. When I visited Larry Fine in his last years of life, I asked him a lot about this practice. He said it was made possible because "Columbia never threw anything away." They still had the old sets and the old costumes. Once in a while, they could even bring back a supporting actor from an old short to be in scenes for the new version.
In 1947, Curly Howard was replaced by his brother Shemp in the act. That made it difficult to pull footage from earlier films but it was sometimes done. Eventually, they made films with Shemp that pulled footage from earlier shorts with Shemp. For instance, Flagpole Jitters (1956) contains footage from Hokus Pokus (1949). Larry said that some of these shorts built around older films were, in effect, made in one day. That's all the time it took to film the new scenes.
If you have the slightest interest in comparing an original film with its later partial remake, I'll make it easy for you. Here's Malice in the Palace, which Larry, Moe and Shemp made in 1949…
Then in 1956, they remade it as Rumpus in the Harem.,,but there was a bit of a problem. Shemp Howard died in late 1955. When he died, the Stooges had four more films to make on their current contract. This was one of them and you'll see plenty of Shemp in the old footage. In the new footage, an actor named Joe Palma — now better known as "Fake Shemp" — stood in for him, hiding his face as much as possible.
I must admit that as a kid watching these films on TV, I didn't notice the substitutions. I recognized the reuse of old footage but didn't notice that Shemp wasn't Shemp in some scenes…
After they made the four films with Joe Palma impersonating Shemp, Columbia assessed the marketplace and decided there were still some dimes to be made with Stooge shorts. They signed Joe Besser to be the third third Stooge and made sixteen more films. Some of them reused footage from earlier shorts and if you look closely, you can get quick glimpses of Curly or Shemp in a few long shots.
The last Stooges short released — not the last one made — was Sappy Bullfighters (1959), a remake of What's the Matador? (1942). If you sit up real close to the set or monitor and turn up the volume, you can see and hear a teensy bit of Curly in it.