There is plenty of mad, mad fun in Max Liebman and Allen Boretz's new comedy "The Flying Ginzburgs" which Vinton Freedley brought to the Plymouth Thursday night, but unfortunately it isn't always clear just what all the shooting is about. Borrowing heavily from "Three Men on a Horse," "You Can't Take It With You," and "Room Service," this moderately amusing screwball farce is hampered by artificial situations, a surfeit of gags, and some uncomfortable let-downs in the last act.

The story concerns the difficulties encountered by one Harry Quill, a rug salesman with a yen for old time vaudeville, in putting on the annual show for his lodge. After assembling a collection of moth-eaten variety artists, one-time headliners but now hovering on the brink of the Borsch circuit, Quill encounters opposition in the form of Tropp, chancellor of the Lodge, who calls the whole thing off because Quill won't let Mrs. Tropp sing three Schubert Songs to infuse tone into the entertainment. But the villain is foiled, and by the use of false telephone calls and a little phony spiritualism, Tropp is brought to terms and the show goes on.

As Gus Delaney, who user to panic them at the Majestic, Eddie Nugent is a stand-out in a pretty good cast. Perey Kilbridge is excellent as Pop Clifford, who travels around the country "straightening out" his son-in-laws. Quill, the meek little man who used to think that men who wore top hats never had to go to the bathroom, is overplayed by Hume Cronyn. Barbara Robbins as Evelyn Quill does nothing to redeem a role which is entirely out of key. Harold Grau, Matt Briggs, Naomi Rae, and Otto Hulett are all good, and Donald Oenslager's hotel room set is particularly effective.