June Blair will eventually become David's real life wife. They married in 1961. She joins the cast in Season 10 as a semi regular for the rest of the series.
June Blair was Playboy's Playmate of the Month for January 1957.
The movie playing at the theater is the same movie that was playing in S7 E16, Ozzie and the Space Age. The title is, The Little Green Men from Outer Space.