Perhaps it would help if I was British, but I've seen several old films featuring the group called 'The Crazy Gang' and I haven't enjoyed them. It isn't that I don't like silly old comedies--but I find the characters a bit annoying and a greater number of their gags fall flat than you'd find in similar films like those of the Marx Brothers or Olson and Johnson in "Hellzapoppin" (a film quite similar to "O-Kay for Sound").
When the film begins, you learn that the Goldberger movie studio is just about bankrupt. Mr. Goldberger is desperate when he learns that the bankers refuse to extend him any more credit and in desperation he tries to get a rich industrialist and his friends to back the studio. However, although this ploy DOES temporarily get the bankers off his back, there is a mix-up and instead of the rich industrialists, the studio limo delivers the Crazy Gang to meet with Goldberger. He is somehow convinced that these obnoxious morons are rich and he falls all over himself trying to impress them. Now considering that the Crazies are out of work and hungry, they are VERY impressed and soon make themselves at home at the studio. Ultimately, however, the mix-up is discovered and the Gang work quickly to complete a film that MIGHT just be able to save the studio.
As I mentioned above, a lot of gags fall flat in this film. However, a few do and the various odd acts they assembled for this film do sometimes work. So, while some of the musical numbers are god-awful and go on far too long, a few (such as the couple who fight as they dance as well as the musical number 'Free') are quite nice. While much of the film lacks sense or decent writing, there is enough to make you laugh and keep your attention. This is not exactly a glowing endorsement, but compared to other films these folks made, it's a huge success!