Luffy swallowing the map shows this version of the Gum Gum fruit doesn't just allow elasticity. It can also use the hammerspace concept. Seeing as Luffy swallowed an arm length container with the map in it.
Buggy is given more depth to why he hates Shanks, rather than just blind anger. Here, he feels that Shanks betrayed him by keeping Buggy himself from getting fame.
In the manga, Buggy normally relies on his special canning balls to kill others. Here, he gets creative with torture.
In the manga the Buggy sets up camp in town and keeps everyone under his thumb with fear. Here, he's destroyed it and forced the victims to be his circus audience and fake laugh with threat of death if they don't.
Kabaji never met Zoro before in the manga. Here, Zoro is responsible for killing Kabaji' brother for a bounty in the past.