Specify in the schematic note that the OV5640 camera's 7-bit slave address is actually 0x3C (not 0x78 which is it's 8-bit write address with the LSB r/w bit set as 0)

The OV5640's datasheet mistakenly says 0x78 for the SCCB slave address (it's supposed to say 0x3C). In binary representation it's 0111 110x, with x as the r/w bit.