The entire film was shot in Europe, so the scene in which Britt Eklund and Peter Sellers visit Los Angeles a matte shot was used for the background of the hotel. The shot contained modern skyscrapers such as the U.S. Bank Building which did not exist during the sixties and seventies.
Sellers, along with some ladies, is seen riding in a stretch limousine version of a late-1980s Mercury Grand Marquis. This scene is supposed to be set sometime between Sellers' divorce from Britt Ekland in 1968 and the filming of The Pink Panther Strikes Again in 1976, and Sellers died in 1980, years before this car was was in production.
The soundtrack does not match Peter's life chronology. He couldn't listen to Tom Jones's "It's not Unusual" when he met Britt Ekland in 1964 (one year before it was released), Marvin Gaye's "I heard it through the grapevine" the same year (actually released in 1967) and David Bowie's "Space Oddity" divorcing Britt in 1968 (actually released one year later).
When Sellers finds out (via the newspaper) that Britt Ekland is arriving in London it is the early 1960s, yet on the wall of his room at the start of the scene is the UK film poster for his film Undercovers Hero (1974).
When Peter Sellers is in Rome to play the first "Pink Panther" he's shown in front of "Cinecittà", the most famous cinema studio in Italy. While Sellers is standing in front of the studio, a car passes behind: it's an Autobianchi Y10, an Italian car, first introduced in 1985, its appearance being 22 years too early.
At the beginning of the scene where Sellers flies to Rome to film The Pink Panther, footage of a BEA Hawker Siddeley Trident taking off is shown. This plane didn't enter service until 1964, the year after "The Pink Panther" was released.
Other motor vehicle anachronisms; Sellers and his family arrive at their new house in a Jaguar S-Type, this model was released in 1963, this scene is set several years previously in 1960; Sellers' red Bentley is towed away by a 1963 Shelvoke & Drewry TZ truck, this scene is set during the making of The Millionairess in 1960; when Sellers has sex with Sophia Loren's stand-in in a Rolls-Royce, the camera moves across some parked cars including a Wolseley 6/110, which was released in 1961, this scene is set in 1960; during the filming of Casino Royale (1966) the director chases after Sellers in a Mercedes W115, which was released in 1968; when Sellers rushes Britt to the hospital to give birth to their daughter Victoria (who was born in 1965) he pulls out in front of a 1966 Ford Zephyr MkIV; and finally in the scene where Sellers is talking to Anne about wanting to make Being There, a Series III Jaguar XJ is visible in the background, this wasn't released until late 1979, this scene is set prior to filming of Being There which began in January 1979.
During filming of "Dr Stangelove", Sellers is in his dressing room practicing one of Group Captain Mandrake's lines, saying "I can assure you, Major Bat Guano, if that is indeed your name." In the film Bat Guano was a Colonel, not a Major.
A cinema marquee advertises "Ghost in the Noonday Sun" (1973)_ despite the fact that this film was shelved until after Sellers' death and never received a theatrical release. "The Blockhouse" didn't have a U.K. theatrical release although it's shown playing on a London marquee.