It wouldn’t be an official Saturday Night Live season without disgruntled comedians complaining that the nearly 50-year-show ripped off their jokes. Sometimes, the accusations are eye-rolling — in October, a New York stand-up complained that Andrew Dismukes’ “Hey Soul Sister” sketch copied his bit. But there’s not much to the allegation — both simply make fun of Train’s cringe song. Get in line. People have been ripping that song for years.

The Whitest Kids U' Know, the 2000s sketch comedy group with a cult hit on IFC, might have a more credible claim to comedy idea theft after the recent John Mulaney episode. As Matt Belloni observed in his What I’m Hearing column, “Last week’s Beppo the monkey astronaut sketch on SNL looks very similar to this ‘Bo Bo the Monkey’ sketch by the Whitest Kids U’ Know from about 15 years ago.”

While the Kids haven’t complained publicly,...