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Being a syndicated cartoonist means having to write and draw a joke each day, 365 days a year, without fail, for as many years as you have the job. I've been doing it since 1985, 24 1/2 years straight without a break. To get an idea of how difficult it is, try to think of an original idea that you think most people might find amusing, and repeat that process every day forever. Like tying balloons to a folding chair and floating over the Berlin Wall, it's harder than it looks.
Because of the difficulty of creating on such an unrelenting schedule, I sometimes get behind and have to rush to meet my deadline. In doing so, I occasionally make glaring mistakes, like my omission of the piano in this drawing.
My editor is supposed to catch things like that, but I guess she's under a lot of pressure, too.