When the bread that is cooking rises out of the pan, a startled Oscar exclaims "The Blob!" Guest star Richard Stahl (who plays Brother Ralph) at the time starred in the recently released "Beware the Blob," the sequel to the original 1958 Blob film.
Brother Ralph's comment "Well, by the old shadow on the floor..." references Dean Martin's catch phrase "By the old clock on the wall I see it's time for...", that he used on his variety show to segue between acts.
The Talking Bra is most likely a bland name product stand-in for Playtex's The Living Bra, whose name inspired many jokes in the Seventies.