‘Coup!’ Review: Jaunty Class-War Comedy Pits Peter Sarsgaard Against Billy Magnussen

That perky exclamation point sets the tone for “Coup!,” a story of murder, class struggle, One Percent entitlement and a global pandemic that nonetheless unfolds with all the eager, scrappy energy of an off-Broadway musical, minus most of the songs. The pandemic in question is not the one you’re thinking of — Austin Stark and …