The characters go through swamps, deserts and yet every day their white shirts are shiny clean and stain free. As usual, the woman's blouse and skirt get torn and damaged to reveal more skin and yet in the final scenes her outfit is remarkably restored.
Horn only has the clothes on his back when Emil finds him, but he has all his clothes at dinner, including his pipe.
The British troops follow the traders all across Africa without any apparent supplies and don't seem to suffer the same harsh conditions when they show up at the end of the Trail.