The Africans in the slave ship are speaking Swahili, a language spoken in countries in east Africa, such as Kenya and Uganda. The Atlantic slave trade kidnapped people from west Africa, where Swahili is not spoken.
When House jumps on the bed to admit CPR on the dying father, his regular shoes and regular clothing are sticking out of under his quarantine suit.
The slave ship shown in the beginning is an early 17th century sailing ship as evidenced by the large side galleries (balconies) near the stern. The ship was supposed to have gone down in the late 18th century and would have been of a much different design, more similar to the USS Constitution that what is shown.