The camera equipment Lucy uses to make her "Western Drama" as competition for Ricky's audition film is all mixed up, to say the least. The camera is clearly an 8mm camera of the type used for home movies in the 1950s, yet when she is seen later editing the film, it is 16mm. Also, when Fred sees the setup, he points to one machine that he calls a projector (and it looks like a projector), and asks what it is for. Lucy explains that it's one of those "new ones", that records the sound right on the film. Sound on film, while rare on home movies in the 1950s, would have been recorded in the camera (where the film is!), not on a projector (where the film will later be shown).
When Lucy, Ethel and Fred make their Western movie, they set camera on automatic exposure so all of them can all appear on screen at once: yet when film is shown, camera somehow follows their action as they move out of set camera range.
There is no glass in the Ricardos' kitchen window.