This was famed director John Boorman's first directorial effort. He also directed "Deliverance" (1972) and "Hope and Glory" (1987) and other major films. If this opening of lads dashing about in a open park and hopping about on a playground reminds anyone of the Beatles and director Richard Lester's "A Hard Day's Night" (1964) from the year before that's probably just what the producers wanted.
The film itself however is more a traditonal romance comedy/drama and should be seen by those who enjoy this era.
From Wikipedia: "Although they perform the off-screen soundtrack music, The Dave Clark Five (unlike The Beatles in their films) do not portray themselves, but appear to be a team of freelance stuntmen/extras led by the saturnine Steve (Dave Clark). Clark had worked as a stuntman on a number of films, which appears to have provided him with a level of cinematic experience and camera-sense rare for a pop-artist of the time.
"Far from being a conventional pop vehicle, the film concerns itself with the frailty of personal relationships, the flimsiness of dreams, and the difficulty of maintaining spontaneity, authenticity and integrity in a stage-managed "society of the spectacle." Boorman's debut offering drew favourable notices from Pauline Kael and Dilys Powell, not least because of the enormous cultural energy of the time (mid-1960s) in which the film was made."
It was released in the USA as "Havin' a Wild Weekend".