In this video, the concept of "accent" is being emphasized as we can clearly distinguish that the main speaker comes from another country. Despite of the fact that he claims he speak perfect, his arabic roots still present in his accent and pronouncation.
In this skecth, the term "dialect" is being conceptualized. Even though they all the speakers belong to the same social group, they have different forms of using grammar and voculary to identify themselves as people.
In this video, the concept of "ideolect" is being conceptualized. The French inspector needs to acquire a perfect english prouncation in order to pass unnoticed. That's to say, he has to pretend to sound like other inside a different social group.