The weapon carried by Sue-Shaun when first meeting "Starbuck" and "Helo" is a British Army L85 Rifle 5.56mm (commonly known as the SA-80). Not a weapon generally used in film and TV making but futuristic looking enough for the show.
In the scene after the shuttle with Apollo, Pesident Roslin and Elosha lands on Cloud 9 they meet Tom Zarek on the flight deck, then proceed to leave the shuttle bay, if you watch closely you see a brief shot of one of the original shuttles used on the original series.
The trivia item below may give away important plot points.
Cally shooting Boomer at point blank range while Boomer is being transferred is a historical reference to Jack Ruby murdering Lee Harvey Oswald (the accused assassin of U.S. President John F. Kennedy) while being transferred from his cell, Aaron Douglas stated that he wanted the scene to resemble the video of the famous shooting as much as possible.