In one of the most entertaining parts of the film, Jagger and Richards sing the tunes of their rivals -- The Beatles' "Eight Days a Week" and "I've Just Seen a Face." Jagger also does an impressive Elvis Presley impersonation.

What they wanted to be when they grew up

Toward the end of the film, some of the band mates talked about their post-rock 'n roll life plans. Jones said he always wanted to be a filmmaker, Jagger considered going back to college, and Watts planned to go back to his former career as a graphic designer. But as it turned out, the Stones did not fade away.

Incidentally, the film's title is a reference to Watts.

"His was the personality that everyone felt was the most endearing -- and cinematic," said Gochanour.

Gochanour also explained the differences between the 1965 and 2012 versions of "Charlie is My Darling." He said he tried to "give the audience a sense of what it was like to be at one of the shows when the band was just coming into their own. I was also trying to show the early effects of fame and notoriety -- and foreshadow the future."

Peter Whitehead's 35-minute 1965 version, on the other hand, is more of an exploration of the band mates' differing personalities.

Gochanour, however, retained the original title because of the film's cult status among Stones fans. He and Klein distinguished this new, 67-minute version by version by adding "Ireland 1965" to the name; thus the new release is formally titled "Charlie is My Darling: Ireland 1965."

As The Rolling Stones celebrate the half-century mark as a band, a rare look at its members when they hadn't yet hit the quarter-century mark as people really puts their resonating success in perspective.

At one point, the interviewer asked Jagger what the secret to his success was.

"There isn't any secret," he said. "It's all very obvious."