Gen.O'Neill's real name is 'Jonathan'
On Gen.Hammond's red phone has his grandchildren on speedial number 1, above the President of the U.S of A.
In the episode "Urgo", Don S. Davis called Dr.Frasier "Teryl" in the corridor scene with Col.Carter.
Dr.Jackson has been compaired to Kenny from South Park, given the fact that Kenny dies in almost every episode.
In the beginning of 'Nemesis(Season 3)' Micheal Shanks had in fact ruptured his appendix and the writers had to rewrite the script the day of shooting the opening of the episode.
Both Claudia Black (Vala Mal Doran) and Ben Browder(Cameron Mitchell) both came to show after leaving the Sci-Fi series 'Farscape'.
Teal'C's birthday is March 14, 1899
In the season 9 episode 'Avatar', Teal'C claims that he plays 'Def Jam Vendetta'.Actor Chris Judge plays the voice of the main villan in the game, D-Mob.
In the opening shots of the time loop sequence in 'Window Of Opportunity', the fruit loops on Col.O'Neill's spoon were glued in place so they were the same in every restart of the time loop.
The season 7 episode 'Heroes(Pt.1-2)' features actor Adam Bladwin as Col. Dave Dixon, who also played Special A.T.F agent James Hamner in the season 3 episode 'Seth'.
In the season 7 episode 'Heroes Pt. 2', Dr.Fraiser states in a interview that Col.O'Neill has had three knee operations. In reality Richard Dean Anderson has in fact had 3 knee operations, the latest one when he tripper while carrying his daughter shortly before filming of season 6.