In the movie, there is a close-up shot of a real leech on a body, but it is not Bogart’s body. So while it seems like Bogart was able to avoid interacting with leeches, his son, Stephen Bogart, shared to the NY Post that “when you're in the water, in the Congo, you're gonna get leeches. They put some on him in strategic places, but he was really walking through the bulrushes.”