Do you think Oscar's father in GB2 was the “stiff” from GB1?
Think about it… Dana and the Stiff appeared to be in a relationship, and I'd say it was more than friends. See how Stiffy got all jealous and protective like a good boyfriend should when Venkman showed up. I could also see him being the type to carry the torch for Dana all through her relationship with Venkman, and then zip right in to pick up where they left off. Hmmm…