I found three times when the song "Johnny Angel" was featured. The first time, of course, is when Mary sang it at Fairbairn College in "Donna's Prima Donna," S:4, E:20.

The second time it could be heard on the jukebox at the malt shop in S:4, E:35, "The Swingin' Set."

The third time it played on the transistor radio that Jeff fixed for Mary in S:5, E:1, "Mr. Nice Guy."

Does anyone know of any other time "Johnny Angel" played on the DRS?

Episode 7-30, "Indoor Outing"--as the Stones are about to go on a fishing trip, Trisha tries to hide the fact that she has the measles. Of course, Alex figures it out, but Donna convinces Alex and Jeff to go on their trip anyway.

Donna entertains Trisha via flashbacks to several Stone trips. One is the trip Donna and Mary make to Donna's college (where Donna evidently studied homemaking). The clip of this trip includes a repeat of Mary singing Johnny Angel.