In an episode with a science fiction con, a guy in a original Galactica Cylon suit walks past "Face". In the episode in question, it's actually Hannibal in the costume. The Actor Allusion was all Dirk Benedict's idea. While filming at Universal Studios for the second season episode "Steel", Dirk spotted a park employee dressed as a Cylon, and decided he wanted to film a little nod to his days as Starbuck. The director told him it was a dumb idea, but let him do it anyway. So, they had the Cylon-clad actor stroll nonchalantly across the frame while Face was all "don't I know you?" Fortunately for Dirk, the scene ended up being quite funny and they kept it in the credits up to season 5.
There was also George Peppard's allusion to his role as Banacek, where he played a similar role, by having Hannibal spout even more off kilter words of wisdom in "The Big Squeeze".
Another one for Peppard. In the Episode "The Rabbit Who Ate Las Vegas", Amy mentions that it's a shame Hannibal's being chased by the military as he is "a terrific actor" after Hannibal goes to great lengths explaining how he'll play his "character". A reference to Peppard's infamously stringent adherence to method acting, even when playing unchallenging roles.
Harpo Does Something Funny: Dwight Schultz has said one of the scariest things during the filming was how blank the scripts would often be.
Also, the writers frequently would not write the tag and then would just say to the actors "just make something up," or told Dwight Schultz and Dirk Benedict to loosely write up a tag.
Throw It In: An extremely frequent occurrence, if grudgingly. There was a heck of a lot of Improv going on by the actors and notably Dwight Schultz, and though the writers frequently got mad by how the actors would go off-script or ad-lib lines, they often (if grudgingly) agreed that it should be kept in.
Screwed by the Network: More like Actively Sabotaged by the Network. The show was considered politically incorrect (showing a positive view of Vietnam veterans, among other things) and its success completely unexpected; it was subjected to Invisible Advertising, the network officials and producers actually badmouthing the show to the press, it was made a 'bad move' to write for, so despite its popularity it eventually succumbed to cancellation.
Stillborn Franchise: While hardly a flop, the film only grossed $170 million on a $110 million budget. The cast and director expressed interest but ultimately concluded that it wasn't profitable enough to risk it.