(at around 8 mins) When two scientists in the background are speaking German, one of them can be heard to slightly laugh after almost mispronouncing the word 'muscular contraction'.
Jean Négroni is known to be the French narrator, but the English version supposedly is voiced by William Klein, the "man from the future".
Vértigo (1958) has a similar scene in which the girl points to her birth date on a slide of a tree. Also, in 12 Monos (1995), the Vertigo scene appears when the Bruce Willis and Madeleine Stowe characters get into the cinema .
The style of the still image of the four people from the future bears a striking resemblance to the later portrait of The Beatles taken by photographer Robert Freeman that would be used as the album cover on "With the Beatles" (released 22 November 1963 in the UK) and "Meet the Beatles" (released 20 January 1964 in the USA).