Grace Makutsi asks her uncle to be her driver so she can follow a suspect. At 25:12 when her uncle arrives driving a large conspicuous Cadillac, her friend BK tells Grace that the suspect will think she's being driven by Robert Mugabe. Robert Mugabe was the president of Zimbabwe. The incongruous joke is that the alleged Zimbabwean President is driving a car with flags on the front of the car, but the flags are of Botswana, not Zimbabwe.
At 30:14 Precious is seated at an outdoor cafe, and the flag on the flagpole is of South Africa to show she has crossed the border. In fact the entire series is filmed exclusively in Botswana.
At 35:35 a group of schoolgirls in uniform includes the first very light skinned actor in the series.