During the dance club scene, set in 1953/4, the guitarist is playing a custom colour Fender Stratocaster. The Fender Stratocaster was introduced in the USA in 1954, and custom colours weren't available until 1956/7.
Also, it if very doubtful any African musician could afford such an instrument. The first Stratocaster didn't reach the UK until 1958.
Shortly after arriving, Killian indicates in a conversation that they are working long days, from dusk to dawn. They were actually working from dawn to dusk.
On the beach she is clearly wearing a bra. When she takes of her shirt to go under the waterfall she isn't.