In the early hours of May 28 1963, while recording 'Blue River', the last song of the session, it was announced as "0307" by the recording engineer while recording. However, unbeknown to the engineer, that matrix number had already been assigned to Jeanne Pruett for her song 'Little Black Book'.

It seems RCA did not realise this mistake until 1965 when 'Blue River' was scheduled for release, and was assigned an new matrix number - SPA4 6768. It is interesting to note that the SPA4 6768 matrix number releates to the unedited Take 2 of 'Blue River' which was not released at the time!

In order to make 'Blue River' longer when originally released as a single it was spliced from 0:00-1:25 and 0:44-1:31 of Take 2, and this was issued yet another new matrix number, SPA4 7357, in 1965. It was this spliced version which was released as a single (47-8740) in 1965, and later on the Double Trouble album in 1967.

RCA acquired the master of 'Santa Lucia' from MGM in May 1965 when it was assigned the matrix number SPA3 5518 and was subsequenly released on Elvis For Everyone (LSP/LMP 3450) in July 1965.

On October 11 1965 a recording session was held in New York to record an instrumental break for 'Santa Lucia' and edit the song to make it longer:
SPA1 6893 is an edit of verses 1 and 2 both repeated, verse 3, new instrumental break, verse 3.
SPA1 6898 is an edit of verses 1, 2 and 3, instrumental break, verses 1, 2 and 3.

Another edit was tried out for 'Santa Lucia' later in October 1965, in an attempt to make it longer, but without the new instrumental break:
SPA3 7091 is an edit of the original SPA3 5518, with verses 1 and 2 both repeated before verse 3.

There is no apparent difference between 'Dixieland Rock' (SPA3 6769) and the originally released master (J2PB 3608) from 1958.