- Dyeing for Your Art: Cyril's actor Melvyn Hayes was a brunette and had to have his hair bleached blond. When the "Bachelor Boy" number was filmed, he had to wear a wig.
- Fake Nationality: Some of the Yugoslavian border officers were actually famous Greek actors.
- What Could Have Been: Barbra Streisand (known for her popular Hollywood musicals at the time) was considered for Barbara, but it was believed that her fame would overshadow Cliff Richard.
Trivia / Summerholiday