Formal structure of  "Savoy Truffle":
Verse 1 0:05-0:28
Verse 2 0:40-1:03
Middle 8 1:12-1:27
Solo (v) 1:27-1:51
Middle 8 1:59-2:15
Verse 3 2:15-2:46
Comments: At just four measures in length, this is one of the shortest choruses in all of Beatles music. In fact, I debated whether or not to classify it separately from the verse, but given the repetition of lyrics and the use of different chords, I conclude that they are different enough to justify the above labeling.
The coda is simply that brief chorus repeated an extra time, resulting in contiguous choruses (like [44b] "Kansas City/Hey Hey Hey Hey",  "I'm Down",  "Think For Yourself",  "Good Day Sunshine",  "It's All Too Much",  "All You Need Is Love",  "Blue Jay Way", and  "Cry Baby Cry").
The tag's function is textbook at the beginning - it serves as an introduction, and also a "structural glue" to hold together the different sections. But after the second time, it is never heard again. Why is uncertain, although I can guess that it would have felt less lean with additional tags before the solo or verse 3.
Looking at the macro structure of "Savoy Truffle", then, it can be divided in two, with each half being further broken down into two iterations of a particular structural pattern:
This blog is a workshop for developing my analyses of The Beatles' music.