This collection contains four very different comedies from four very different types of comics. It is part of over a dozen sets produced by Warner Home Video to bring classic film to the masses by making inexpensive sets of the better films in their libraries that have no extra features.
The oldest in the bunch, "A Night at the Opera" (1935), revived the career of the Marx Brothers after they were released from their contract at Paramount. Irving Thalberg thought that the brothers' comedy still had merit and that part of their problem was that "they never helped anybody". The test of time has shown that, although not profitable at the time, the Paramount Marx comedies were the best film work that the brothers did. However, that doesn't mean that this film isn't great. It is also available in a more deluxe form in the collection The Marx Brothers Collection (A Night at The Opera/A Day at The Races/A Night in Casablanca/Room Service/At the Circus/Go West/The Big Store).
"Arsenic and Old Lace" (1944) stars Cary Grant in a classic dark comedy. Grant plays a newlywed who finds out that his aunts have made a habit of poisoning their elderly male boarders and burying them in the cellar. This has only been available in the past as a single DVD, and it is an older one at that - released in 2000 I believe.
"Father of the Bride" (1950) has Spencer Tracy as a man who begins to feel his age and his pocketbook when his daughter (Elizabeth Taylor) gets married. It shows Tracy has a knack for comedy even if Katharine Hepburn is not involved. This is available in a more deluxe edition in the now out of print The Elizabeth Taylor Signature Collection (National Velvet / Father of the Bride / Cat on a Hot Tin Roof / Butterfield 8).
Finally there is "The Long Long Trailer" from 1954. Made to capitalize on the popularity of the TV series "I Love Lucy", the film is pretty funny in its own right even it is basically Lucy and Desi playing their TV characters under other names. The two play newlyweds who buy a motor home instead of a house and almost ruin their marriage by going on a cross-America trek in the thing. This is also available in The Lucy & Desi Collection (Too Many Girls / The Long Long Trailer / Forever, Darling). By and large I don't think that the movies ever figured out what to do with Lucille Ball, but this is one of her better efforts in film.