When Astrid and Walter are walking though the boathouse, an animated green frog with huge blinking eyes can be seen to their left, before reappearing in the animated part of the episode.
The coded glyphs at the commercial breaks spell out GUILT.
In a variation of the show's running gag, Walter calls Astrid by her correct name, an early hint that he's on acid.
The Loyalist patrol at the boat dock were using futuristic looking machine guns. Those are the FN P90, developed in 1990, firing rather small but very high velocity bullets. The magazine holds 50 rounds, all of which can be fired in about 3 seconds. This was a standard weapon in Stargate SG1.