A scene in this movie is said to show the first use of a "selfie stick".
At one point of its development, the film was planned as a Czech-Spanish co-production and Spanish singer and actress Marisol was considered for the part of Gwen Williams, eventually played by Jana Brejchová.
David Moore, played by Jirí Sovák, while riding in a carriage, thinks about how he could have killed Hitler through time travel and thus prevented World War II. Ironically, a few years later, in the comedy Tomorrow I'll Wake Up and Scald Myself with Tea (1977), it was Sovák who played the leader of a neo-Nazi group who, through time travel, wants to bring Hitler a state-of-the-art weapon so that he can win World War II. Both films also share screenwriters Milos Macourek and Josef Nesvadba.
Lorna Vancurová's debut.
Although the whole plot is of course wildly fictional, Albert Einstein's stay in Prague in 1911 is a historical fact.