Howard said he was never in Bob's office before. He was in Bob's office in episode one, Fly the Unfriendly Skies.
"Hi, Bob"-ometer: Three, all from Howard. 38 for the series.
The opening sequence in this episode is an example of the "long" opening sequence. It begins with Bob answering his telephone and ends with his kissing Emily at the door of his apartment. Other episodes feature shorter opening sequences, depending on the timing of the episode itself. For example, the opening phone call is frequently omitted and quite often the scenes of Bob boarding and riding the train are omitted. For an example of the "short" opening sequence, see the following episode, "A Home is Not Necessarily a House".
The teaser to this episode contains another classic Bob Newhart telephone bit.