Most of the HL fan boys i know have been talking aout glados being in episode 3
Did you not play episode 2?
They explain that Aperture Science was working on some project, blah blah, and you have to go to some ship wreck of an Aperture Science storage transport vessel to check it out. The "famous" ship had gone missing and they had apparently just found it with a drone or something. I don't exactly remember but it went something like that, so yes, there are plenty of possibilities like that or even the portal gun itself appearing in ep3.
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