Both Alex Zahara (who portrays Warrick Finn), and G. Patrick Currie (who portrays his brother Eamon) play the 2 main Unas characters (Iron Shirt and Chaka) in the previous episode Enemy Mine (2003).
The hangar where the Sebrus is being prepped contains several brightly colored columns with varied rings and stacked discs. Those are not props. The location is a high voltage resonant testing set where large electrical equipment like transformers are tested.
The image of the planet Hebridan is an upside down distorted view of Earth, as you can clearly see the Indian peninsula along with Sri Lanka. Also, on the top right corner, you can see the Persian Gulf, which lies between Iran and Saudi Arabia.
Teal'c uses the same alias (Murray) that he used in Point of No Return (2000) and Wormhole X-Treme! (2001). Eamon says, "You are going to need a hat," which is how they always try to hide the symbol on Teal'c's forehead.