Dee kills each of the guys in her fantasy and is killed in each of the guys' fantasies except Dennis'. She is hit in head with nunchucks in Mac's, heard being attacked by police dog in Frank's, and shot several times in Charlie's. Dennis doesn't include her at all outside of the convenience store.
The 100th episode of the series.
When Dennis sees Jackie Denardo in the hospital, the song "Alone" by Heart plays. The same song played when he first saw her in the episode "The Storm of the Century." This happens again when Frank meets her later in "The Gang has a Jumper." Basically anytime Jackie is introduced, Heart is introduced.
The mansion in Dee's part is the same used in Columbo s5 ep1 'Forgotten Lady'
Frank eats at least three hot dogs in his fantasy sequence.