In “ A Very Jonas Christmas Movie ,” a synthetic holiday trifle whose chief asset is that it knows and even winks at how much it’s a synthetic holiday trifle, one of the more amusing scenes has the Jonas Brothers showing up at a hotel in Amsterdam to see a cabaret performance by Ethan, an old enemy of Nick Jonas ’s portrayed by Andrew Barth Feldman. It seems that the two had been in a Broadway show together — a musical version of “Home Alone,” with Ethan as the Macaulay Culkin character and Nick cast as the dad. Ethan felt patronized by the pop star, and the two didn’t get along.

The reason the Jonases have shown up is that they want to hitch a Christmas ride home on Ethan’s private plane. (Their own tour jet blew up, because…well, we’ll get to that in a minute. It has something to

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