SGA 4x03 Reunion - Actor Crossover
Mark Alan Dacascos (Tyre, fellow Satedan to Ronan) also plays the 'Chairman' on Iron Chef America. I had such a problem watching this episode because of this actor cross-over. I was too distracted making comparisons with the visuals.
Overall I didn't watch the show as carefully as I normally would have so I can't comment on the various nuances of the show but it really is amazing the amount of dialog that David Hewlett has to memorize.
The one thing that I did pick up.... it was nice to see Ronan's allegiance to Atlantis was solidified.