Character mistake: Maggie and Rembrandt go into Alt-Colin's room thinking it's their Colin. But then begin to question when he had time to buy a suitcase, get his stuff monogrammed, and where he would get the money for it. When they find Alt-Colin, he has expensive jewelry on and is acting weird, saying "homie" and hitting on Maggie. And yet they still act like this is their Colin and don't think about it being his double, despite the fact that they constantly talk about and met their doubles.
Character mistake: The Sliders are constantly trying to interact with a new world despite not knowing anything about it. This action often leads to misunderstandings, arrests, or threat of death. Sometimes there's even posted signs that they don't bother reading until it's pointed out by someone they've upset or annoyed. Yet they continue this action. They played a death lottery without asking question, order beer when it's not available to them, or try to pay without local currency.
Chosen answer: Quinn's brother was going to be a recurring character, so "introduced" in this case referred to the actor becoming a semi-regular.
Jean G