There were a lot of similarities between Murder by the Book and Publish or Perish. I liked when he said to Columbo in "Murder by the Book," 'Now if you'll excuse me Lieutenant....." In a very hostile tone. I also liked his portrayal of the drunk in the restaurant in Publish or Perish. But to me, my most favorite Cassidy episode was "Now You See Him."
i really don't think i could decide which episode i like him better in. every time i finish watching one of these i always say that i liked him best in that episode....but then i'll watch another one and i think he is the best in that one......i've decided to decide not to decide!