Indeed, xylinder swaps with Remingtons are movie moves, but remember that there are numerous references to Jack Hays Rangers doing just that with their Patersons when fighting the Comanche in the early to mid 1840s. Each of the Patersons he acquired from the Texas Navy warehouse in Galveston came with 2 cylinders serial numbered to the revolver and no on board loading lever.
Howdy Again
Not just in the movies. Popping the cylinder out and popping it back in again is exactly how I treat my Remmies when I bring them to a CAS match. Mine are equipped with the original R&D conversion cylinders and I shoot them with Black Powder loads of either 45 Colt or 45 Schofield. There is no loading gate on my guns. In order to reload I have to pop the cylinder out, remove the cylinder cap, dump out the empties, put in five more rounds, pop the cap back on the cylinder, and pop the cylinder back in the the gun. That's the only way to reload, ya can't get the empties out and fresh ones in unless you remove the cylinder. So being able to effortlessly remove the cylinder makes things much easier. I have two such conversion cylinder equipped Remmies, my old Euroarms that I bought back in 1975, and a stainless Uberti that I bought about ten years ago.
Regarding Patersons, there was no way to reload them in the field. Besides the fact that there was no loading lever, a special tool was provided with each gun for reloading the cylinders. You had to use the tool to reload the cylinder, after you had pulled the wedge, removed the barrel, and pulled the cylinder out. Not something that was possible to do in combat conditions.
The Paterson Colt was very much a learning experience for Colt. Besides the fact that he went bankrupt after producing them, the Paterson was only five shots, and reloading was difficult. About ten years later when Colt collaborated with Captain Walker over the Walker Colt, they took to heart some of these lessons learned, making the gun a 44 caliber six shooter and adding a loading lever. There were some pretty significant changes to the frame and lockwork too. But the pendulum swung too far and the behemoth they created was too big to be practical. That's why there were only 1100 made. Still in the learning curve, Colt kept working through the Dragoon series until the 1851 Navy was built and the 1860 Army, the epitome of percussion revolver design.
In my humble opinion of course.