Connections

In the Blue Universe, there is a "Tulip Saloon" bar in the background during the intro scene and the elder widow has white tulips in a vase behind her in the last scene.

Walter says, "I asked for a sign of forgiveness, but I got nothing." He is talking about a "white tulip", which (when Peter was in the Blue Universe) Walter did in fact receive - as a drawing of a white tulip due to the events from the episode.

When Nina and Olivia meet in the opening sequence at a restaurant, white tulips in water are on the table.

A scientist creates a time loop in order to try to be with a deceased loved one.