It was not a good imitation. Playing the longtime “Jeopardy!” host on “SNL,” Ferrell was piqued and perennially at his wit’s end over the regular haranguing of Darrell Hammond’s Sean Connery and the confounding idiocy of other celebrity contestants. Asking these competitors to write a word — any word! — for Final Jeopardy or solve a category called “Movies That Start With The Word Jaws,” this Trebek, who never shaved his iconic mustache, ended each show with a glower and a dimmer view of humanity. Obviously, that was the joke. For 37 seasons, the actual Trebek, whose final...