In the scene where Samantha Carter is about to release an EM pulse in the room in an effort to discontinue Urgo's annoying appearances, Urgo is protesting his "demise" and trying to prove he won't bother anyone anymore. He says, "What about this?" and changes into a younger man in military uniform. "Can you resist this?" he then asks before he switches back to his familiar form. The actor playing Urgo, Dom Deluise, is actually replaced by his son, one of the directors of Stargate SG-1, for this switch. See more...
Updates: 
Series 3
Factual error: When listing off the items Orlin has ordered online to produce his own stargate, Simmons lists "seven 100,000 watt industrial strength capacitors". Capacitors are measured in farads, not watts. Not to mention that as of now, the world's best capacitors are less than 10,000 farads, not an order of magnitude higher.
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