Sentimental Anniversary - S3-E15
Continuity mistake: While Lucy's showing Little Ricky the pictures in the album, we see Lucy's fingernails are not polished, but in the closeup of her hand pointing to the photo the fingernails have dark polish on them. This happens again when Lucy's looking through the album with Ricky.
Chosen answer: It's not known. She may have moved it to the spare room or it may be in a corner just off camera. There could be any number of reasons, though it probably took up too much room on the studio set, and it was removed, making it easier for the actors to move around.
raywest ★