Mom and I saw "The Play that Goes Wrong Yesterday."
Before the play starts the audience see the backstage staff doing last-minute adjustments to the set, including trying to mend a broken mantlepiece, and to find a dog that has run off.
The fictitious Cornley Polytechnic Drama Society, fresh from such hits as The Lion and The Wardrobe, Cat, and James and the Peach or James, Where's your Peach?, has received a substantial bequest and is putting on a performance of The Murder at Haversham Manor – a 1920s murder mystery play, similar to The Mousetrap, which has the right number of parts for the members. During the production a plethora of disasters befall the cast including doors sticking; props on the walls falling down; floors collapsing. Cast members are seen misplacing props; forgetting lines (in one scene, an actor repeats an earlier line of dialogue and causes the dialogue sequence triggered by that line to be repeated, ever more frenetically, several times); missing cues; breaking character; having to drink white spirit instead of whisky; mispronouncing words; stepping on fingers; being hidden in a grandfather clock; and being manhandled off stage with one cast member being knocked unconscious and her replacement (and the group technician) refusing to yield when she returns. The climax is a tribute to a scene in Buster Keaton's film Steamboat Bill, Jr. (1928), when virtually the whole of the remaining set collapses.
It had a lot of physical humor and a lot more planning (to ensure safety) than it appeared. Overall, it was a cute show.