I can think of two sketches that had their endings changed since their debut. Was it censorship? Not sure.
1. The rolling ball that weaves down a maze of ramps, flags, rollers, etc., occasionally counting 1-2-3. Originally, at the end, the ball rolled off the track and bounced into a metal box with a hand crank. A boy came by and turned the crank while counting to 3, and wound up with an orangy powder in his other hand. By its color, we assumed the ball was ground into this powder. But in later years, the ending was redone to have the same ball land in a machine that dropped cherries on top of ice cream sundaes as part of an assembly line. Was this changed because they thought it was too sad (I'm not going to say traumatic) for the kids to see the ball reduced to sand? Or was it to give the whole thing a sense of context: a cherry dispenser makes more sense than some powder grinder.
2. The number 12 sketch featuring multicolored balls that roll around in the sand. You know how at the end, when the twelve balls roll off to the right (to keep from getting trampled by the crowd) and form themselves into a number 12 shape while counting off? After that they turn into real digits to the sound of an organ chord. Then the numerals fade away to an eerie sound reminiscent of wind blowing. I was told that the sketch now ends before the number disappears. Was it considered too traumatic to see the number, apparently composed of sentient beings, just vanish into thin air?