The sportscaster shown at the end of the archived news clip is Sarah Palin, before she became the Governor of Alaska and Vice President nominee around two decades after the events depicted in the movie.
According to an article on the Greenpeace website, the Rachel Kramer character (Drew Barrymore) is based on Greenpeace wildlife campaigner, Cindy Lowry, who appears in the closing credits in archival footage.
The movie was filmed under the working title "Everybody Loves Whales." John Krasinski's character, Adam Carlson, pays homage to the working title when he says that "everybody loves whales" in a particular scene.
Much of the footage for the film was shot in and around Anchorage, Alaska. The ice scenes were filmed at Beluga Point south of Anchorage, and several scenes which in the film took place in California were actually shot on location in the Turnagain neighborhood in west Anchorage: plants native to Southern California were used to dress the houses in those scenes. Real Alaska National Guardsmen were used to play the Guardsmen in the film.
One of the reporters shown in the movie is played by Jackie Purcell, real-life chief meteorologist for KTUU-NBC Channel 2 in Anchorage, Alaska - the station for which Adam Carlson, John Krasinski's character, works in the film.