The day after I watched this (the 20th), I realized something about the song. In the chorus, the title phrase is interrupted:
But I reallyThat it's constantly interrupted illustrates that the narrator is "a busy man," as if he's called away to something else in between each fragment.
I really haven't
I really haven't got the time
I really
I really haven't
I really haven't got the time
I really haven't got the time
Yester-day, while thinking about the song again and drafting this post, I realized something else. The "Really haven't got the time" in the coda (at ~2:57) is sung to this phrase:
This is just a slight reworking of a section of "Westminster Quarters," which is often used in clock chimes. As I know it, it's something like:
with one measure played for every quarter hour (one measure at fifteen past, two measures at half past, and so on). At the top of the hour, the whole thing is played, followed by the third (B in this key) played once to mark one o'clock, twice to mark two o'clock, or what have you.
Using a section of this melody indicates the importance that the narrator places on his time.