By 1971, these two tracks, together with the 1970 B-side "You Know My Name (Look Up the Number)" (which was not included on Por Siempre), represented the only Beatles songs that had not appeared on one of the group's UK or US albums.

While "I'm Down" was included on the 1976 Capitol Records compilation Rock 'n' Roll Music,[3] Por Siempre continued to be the only album among all the Beatles LP releases around the world to include "The Inner Light".

[4] The song subsequently appeared on a bonus disc in Parlophone's 1978 box set The Beatles Collection, and then on the spin-off release, Rarities, in 1979.

Although none of the twelve tracks on Por Siempre Beatles had appeared on an official British studio album by the Beatles, "Day Tripper" and "We Can Work It Out" were included on the 1966 UK compilation A Collection of Beatles Oldies, while "The Fool on the Hill", "Strawberry Fields Forever", "Your Mother Should Know", "Penny Lane", "Baby, You're a Rich Man" and "Blue Jay Way" all appeared on the American Magical Mystery Tour LP.

The latter, while widely available as an import in Britain since 1967, received an official release there through Parlophone in 1976.