There are a whole lot of Simpsons references throughout the series, since it is O'Neill's favorite show. Commentary on the DVD's reveals that these were included because it is Richard Dean Anderson's favorite show in real life. Which culminated in Dan Castellaneta's appearance in the episode "Citizen Joe" (as well as Anderson's appearance as himself in the Simpsons episode "Kiss Kiss, Bang Bangalore", attending a Stargate convention).
Carter's "It took fifteen years and three supercomputers to MacGyver a way to open the gate" line, improvised by Tapping.
In "Tangent", Daniel claims to be "The Great and Powerful Oz", which is only one of numerous references to The Wizard of Oz throughout the show. Jonathan Glassner mentioned on the DVD featurettes for season 3 that it became a Running Gag between him and another writer to see how many Wizard of Oz references they could fit into the show.
Later, when Daniel and Sam tell Jacob Carter that they were hoping he could "beam" Teal'c and O'Neill out of their out-of-control craft, he incredulously asks if they think he is Scotty.
O'Neill wants to call the Prometheus the Enterprise.
A season seven episode was actually titled "Enemy Mine".
In "Avenger 2.0", Felger prominently packs a roll of duct tape in his pack when he plans to go off-world with Carter. DVD audio commentary confirmed that this was reference to The Red Green Show, which starred Felger's actor.
In "Zero Hour", when the alien plant grows out of control Dr. Lee jokes that at least it has not eaten anybody yet; O'Neill's only response is to thank "Seymour".
Daniel calls himself "Hans Olo" in "Prometheus Unbound".
Not to mention that he is also captured by someone in face-concealing black armor who beats him up, then, when he's tied down, removes her helmet, revealing Claudia Black — a definite shout-out to the first reveal of Aeryn Sun in Farscape.
Season eight episode Avatar has Carter remark that Teal'c played Doom when entering a simulator that is be very similar to it. He responds saying he played Def Jam Vendetta. Teal'c's actor did voice work for the latter.
In the season nine episode "Ex Deus Machina", one of the persons of interest is the CEO of the Stark Constortium.
In season nine's "The Scourge", Mitchell motivates a tired bureaucrat to keep marching by making up "treeferrets", a dangerous arboreal creature that can separate a man's head from his shoulders. In the Honorverse, treecats are dangerous arboreal creatures that can separate a man's head from his shoulders, and are described as actually looking like ferrets, not cats. Later, when Mitchell and Teal'c discuss what they are going to watch on movie night Teal'c explains that he was considering Old School. At the end of the episode, after defeating the horde of alien insects, Mitchell explains that they are instead going to watch Starship Troopers.
Vala says she became pregnant without having sex any time around when conception must have been. As she is unfamiliar with Earth culture she asks the team if they have ever heard of anything like this. The viewer and some members of the team obviously think of Jesus, but Teal'c speaks up quickest with "Darth Vader". Vala immediately asks Teal'c how that turned out, and nobody seems willing to answer. A moment later, Mitchell says he was thinking of King Arthur.
When Vala tells SG-1 about an unpleasant man named Seevis, Mitchell summarises with "Seevis is a butt-head".
In "Morpheus", Vala "studies" for her upcoming psychiatric review by researching the Earth internet. One of the questions she prepares for is from the Voight-Kampff test from Blade Runner, which is administered to see if the subject is a replicant.
Vala: "You are in a desert. You see a tortoise that's lying on his back in the hot sun. You recognise his plight, but do nothing to help. Why?" ... Hmn. Why...? Ah: "Because... you are also... a tortoise..."
The episode "200" revolves around the production of a Wormhole X-Treme! movie, which was being produced even though the show had been cancelled after airing only three episodes. DVD commentary confirmed that this was a reference to Firefly and Serenity. "200" is a hurricane of Shout Outs, with entire segments dedicated to Star Trek, The Wizard of Oz and Farscape, as well as a short Gilligan's Island reference.
One sequence was an abridged mashup of elements of the movie and pilot episode, done in the style of Team America: World Police (or the show Team America parodied, Thunderbirds), complete with puppets by the Chiodo Brothers.