Marcy's wedding ring
In "Girls Just Want to Have Fun", Marcy lost her wedding ring, but it was later returned to Steve. Steve hides it in an envelope, but then later gives the envelope to Marcy, pretending not to know what was in it.
I noticed that while the ring was supposed to be hidden in the envelope, Marcy is wearing a ring. Did she borrow one? Or was this an actual blooper?