A retroactive one: The "young hip" Mitchell in 200 is played by Finn from Glee.
In affinity, Lois Lane from Smallville is Teal'c's neighbor.
Wayne Brady plays a Jaffa in the season 8 episode "It's good to be King". Guess Dave was right about Wayne Brady's dark side.
Bob is the diner owner in season 10's "Memento Mori" when Vala loses her memory.
Don S. Davis appeared in at least two episodes of MacGyver. The first appearance was as a cement truck driver who lent his truck to Mac in his latest disaster relief, and the second as a hunter trying to track down Mac in order to silence him about illegal hunting.
In "Window of Opportunity" a minimum number of the Groundhog Day Loops experienced can be calculated. At the end it is said the Tok'ra have been trying to reach them for over three months. No set values are given, and we don't know when the Tok'ra began to try to contact Earth. With this, considering an average of 30 days to a month: 30(3 months)= 90 days. 90(24 hours)=2,160 hours. About ten or so hours per loop, so 2,160/10=216. Teal'c and O'Neill experienced a minimum of 216 loops, probably many more.
Sergeant Siler is routinely battered throughout the series, from being a test target for new staff-weapon armor, to having a DHD blow up in his face. At first glance it's just a running gag, like Daniel dying and coming back to life all the time, but then you see the credits and find out that Dan Shea, the actor that portrays the good Sergeant, is also the stunt coordinator. Also, Shea was Richard Dean Anderson's stunt double in both MacGyver and SG-1.
