When the girls are shot at through the flat window a glass ornament is seen to shatter even though it is well below the firing line of a gun in the street below.
The uniformed police officers can be seen wearing modern style Police helmets which did not exist in the 1960's. The chin straps they use were not introduced for standard issue helmets until the late 1970's. Police helmets of that period had just one thin leather strap.
Mandy Rice-Davies speaks of her lover Peter Rachman as having "passed", that is, died. This Americanism was unknown in Britain until the 1990s and is still rare in the 21st century; British people more usually say "passed away".