It's the presenter (or the person) who makes the difference, 这是个强调句结构：it's ... that (who) ... .
that (who) 是不能省略的.
这句话改成普通句是： the presenter makes the difference, the presenter 是主语,makes 是谓语, the difference 是宾语.
and three things （that all great presenters do）.that 引导了一个定语从句,从句中,that是连词,定语从句的先行词是three things.all great presenters是主语,do 是谓语. to的语法地位无法交代. 与此同时 and three things 和 the difference是并列宾语（前面makes谓语动词的宾语）.
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