"The Hollywood Reporter also says that Snakes on a Plane went back before the cameras this month for five days of additional shooting in Los Angeles. The film wrapped principal photography in September in Vancouver.
In this case, it wasn't the usual reshoot, hastily assembled to fix a nagging story problem. Instead, the studio decided to create new scenes that would take the movie from PG-13 into R-rated territory. The second round of filming also came about because of intense and growing fan interest in the movie.
When director David Ellis assembled Jackson and others for the recent shoot, the filmmakers added more gore, more death, more nudity, more snakes and more death scenes. And they shot a scene where Jackson does utter a line that fans have demanded.