Yep, shoot the same action twice. Not unusual to shoot the same scene 4 or 5 times (not different takes different setups). For a typical conversation between two people you might shoot it wide to get both of them and a good bit of background, then shoot it in a medium close up so you have the two of them just waist up, then shoot it over person A's shouder looking at person B, then over person B's shoulder loooking at person A. If you wanted to get REALLY crazy you could also shoot it in extreme closeup of person A and extreme closeup up of person B. So there you have one scene shot 6 times, figure at least 2 or 3 takes for each (if you're lucky) so 12 to 18 takes of the same scene. Looking the same is the job of the DP who and director who make sure the lighting looks the same, and the continuity person or script supervisor who makes sure the glass is equally full, or the cigarette burned the same amount in every take.