That Little Old Matchmaker, Martin - S1-E12
Character mistake: In Bill's office, after Tim talks about the acoustics in the building, Bill calls Tim "Bill." (00:15:51)
My Favorite Martian (1963)
1 character mistake in season 1 - 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: We don't have love at first sight on Mars. Either it was too silly to bother with, or it was something we discarded in our Dusk Ages.
Tim O'Hara: You mean the Dark Ages?
Uncle Martin: We were never that primitive.