Unlike most other 1960's soundtrack there is no subjective decision to make whether the 'Viva Las Vegas' 
masters should be remastered from 3-track for release or not, simply because there were no (final) original stereo masters produced for 'Viva Las Vegas' in the first place. It is not an easy task because of dry sound and unrational use of the 3 tracks available. How a mix should be done is usually too subjective to even argue about, but perhaps not in this case.

Yellow Rose Of Texas / The Eyes Of Texas, The Lady Loves Me, You're The Boss, and Santa Lucia were recorded with backup vocals only on the third, "empty" channel.

No effort at creating a stereo or even mono image can improve this situation and it is considered necessary to keep the instruments on one stereo channel, the vocals centered, and the backup vocals on the other 2-track stereo channel. This will leave an almost empty right channel, and a certain amount of leakage from the instrumental channel may be necessary. It is exactly this approach has been taken on the 2003 FTD 'Viva Las Vegas' soundtrack, which is an ambitious attempt at remastering the entire 'Viva Las Vegas' soundtrack. 

M.G.M. soundtracks were recorded dry and the typical 60's approach would be to apply dynamic processing for record release, especially utilizing dynamic compression and only light reverb of the vocal channel. Using just a little compression and hardly any reverb makes this modern attempt a success overall and so much better than previous efforts. The result does not sound alien beside the original 'Girl Happy' LP masters, which were recorded in the same manner as 'Viva Las Vegas' and also by George Stoll and Dave Weichman.

Sadly, the amplitude level has been pushed up about 3-4 dB over the 0 dB limit on the FTD 'Viva Las Vegas' soundtrack and this distracts from what otherwise would have been an excellent release all the way. The title song Viva Las Vegas (master) is for instance first clipped from amplitude overload and then limited to -3 dB, just to make sure that all reasons for the initial compromise were eliminated as well - and leaving us with "the worst of both worlds".

The Climb has lead vocals by George McFadden of The Jubillee Four and backing vocals by Elvis and The Jordanaires.
Take 9 of The Climb is listed as being on FTD's Classic Album of 'Viva Las Vegas' but it's actually takes 1, 4, 5 and 9.

There is too much digital echo (by any standard) on the 'Double Features' version of Yellow Rose Of Texas / The Eyes Of Texas.

It has been rumoured that You're The Boss was originally intended to be used on RCA's 'A Golden Celebration' box set in 1984, but the tape was lost (or stolen) while the set was being complied. The Master intended for 'A Golden Celebration' was finally issued in 1990 on the CD 'Elvis Sings Leiber & Stoller' and 'Collectors Gold' set, and it was spliced from Take 16 and the ending of Take 3. The "Original" Master as cut on acetate during the sessions is just Take 16 alone, and was first released on 'Double Features'. Take 3, alone, was also issued on FTD's 'Silver Screen Stereo' but has added echo.

The duet version of Today, Tomorrow & Forever (2011) was also intended to be issued on 'A Golden Celebration' in 1984 but the tape was lost (or stolen) while the set was being complied. It was finally issued on BMG's 'Today, Tomorrow & Forever' box set in 2002.

Today Tomorrow & Forever (2012) is an unused medium tempo instrumental track that includes backing vocals. The arrangement is similar to the duet version, and was probably considered to be used for the movie version.

The unused Take 4 of Today, Tomorrow & Forever (2014) is a dubdown to instrumental track of 2013 Take 4, and was probably considered to be used for the movie version of Today, Tomorrow & Forever (2016). Take 6 of Today, Tomorrow & Forever (2014) is a dubdown to instrumental track of 2013 Take 6 but has the second bridge and third verse edited out, and was used for the movie version of Today, Tomorrow & Forever (2016).

The movie version of Today, Tomorrow & Forever (2016) is a vocal overdub of 2014-06, but has the Jordanaires big ending edited out of the track before Elvis' vocal overdub. The version used in the movie 'Viva Las Vegas' has the second verse edited out too, after Elvis' vocal overdub.

According to "Sessions III" the movie version of C'Mon Everybody is primarily take 7, take 3 ('hand clapping' and 'finger snapping') and the ending of take 1.

The master of Santa Lucia is spliced on the FTD soundtrack with the first part being from the 1965 2-track album master, so there is reason to believe the master tape is damaged. The correct 1965 'Elvis for Everyone' LP master matrix number is SPA3 5518, rather than the unused SPA1 6893 or SPA1 6898 assigned in October 1965.

'A Life In Music' and 'Sessions III' both incorrectly list the matrix number for Santa Lucia as being SPA1 6898.

In March of 2007, Sony decided to go through all of Elvis' masters. They retransferred everything and remastered all tracks including repairing as many clicks, pops, bad edits and dropouts as they could. They have used these newly mastered recordings on their new releases since 2007 including budget soundtracks, 'Legacy' releases, the 30 disc 'Complete Elvis Presley Masters' collection and the Franklin Mint package.