The convertible roof of the white Triumph Herald that Jean Marsh drives is removed in the close ups and in place for the distance shots.
The sound heard during the helicopter escape sequence is the wrong sound for the SA-316B Alouette II. Heard is the sound of a piston engine and 2 blade main rotor (such as a Bell 47). The Alouette II has a 3 bladed main rotor and jet turbine engine both of which make a considerable and distinctly different sound.,