Continuity mistake: The fireplace moves from episode to episode, from the center of the room to the corner.
My Favorite Martian (1963)
1 continuity mistake in show generally - chronological order
Starring: Bill Bixby, Ray Walston, Pamela Britton
Oh, My Aching Antenna - S1-E33
Continuity mistake: Even though Tim and Uncle Martin live on the 2nd floor at Mrs. Brown's above the garage, every view outside the living room window with the sheer drapes shows the house across the street from a ground floor perspective. This happens in multiple episodes.
Uncle Martin: After all as a very wise man once told me, the chicken is not infrequently the true dove of peace.