Stargate SG1 - Foothold

Aliens once again invade the SGC with a Foothold situation. Does the SGC have a dry cleaner on base? Are we sure the SGC doesn't want to keep people in? Because it should… There are also just some general security plotholes that can break your brain if you think about it too much. Sam also makes the leap to the aliens having a live connection to their SG counterpart way too quickly without really any reasoning. How exactly do mirage clothing and props work? Because somehow the fake Jack and Daniel changed clothes when they shouldn't have been able to? Finally, where are the real SG6?