Greg: I thought you were in rehab.
Corey Feldman: No, that was Corey Haim.
The two Coreys, both former child stars who occasionally appeared together in films, are friends in real life -- which has led to people confusing them. Haim was actually in rehab the year this was episode was taped... for like the 1000th time. Feldman himself went into rehab in 1991.