OK, so here's a recording of Dylan and George Harrison singing "Cupid" and "Da Do Ron Ron" on 1 May 1970:

https://www.youtube.com/watch?v=C2s3hBTxQko

I don't see a vocal bridge, so maybe I'm listening to a different recording. There is an instrumental bridge in "Cupid," but it's just an extended version of the usual one from the original song. This recording is a medley of "Cupid" and a performance of "Da Do Ron Ron" with different lyrics.
-Joe-

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The Dylan lyrics for "Da Do Ron Ron," such as they are, are here:

http://www.maggiesfarm.eu/testiD/dadooronron.htm

DA DOO RON RON
(words and music Jeff Barry, Ellie Greenwich, Phil Spector)

Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron.

I met her on a monday,
I met her on a monday,
I met her on a monday,
yes I met her on a monday.

Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.

Well I say goodbye on tuesday,
say goodbye on tuesday.
Say goodbye on tuesday.
Say goodbye on tuesday.

Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.

She came back again on wednesday.
She came back again on wednesday.
She came back again on wednesday.
She came back again on wednesday.

Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.

She left again on thursday.
She left again on thursday.
Left again on thursday.
She left again on thursday.

Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.
Da doo ron ron ron da doo ron ron ron.

I saw her last friday.
Da doo ron ron ron da doo ron ron.
Da doo ron ron ron da doo ron ron.
Da doo ron ron ron da doo ron ron.