The title makes reference to the novel 'The Strange Case of Dr Jekyll and Mr Hyde' by Robert Louis Stevenson.
Gail says that she's 13 3/4 old. At the time, Kim Richards, who played Gail, was 18.
As Gail, Kim Richards wears braces and does not as Lillian.
Gopher dates and falls in love with a 13-year-old girl passenger.