When Rory wakes up after Logan has gone to London, she finds he left her a model rocket ship as a gift (ep. 7.01). She pretends she understands the reference, but only later finds out that it's a reference to an old Twilight Zone episode, called The Long Morrow (also the title of this episode). The rocket ship is symbolic because it's about a man waiting his whole life for someone, as he was going to wait for her while in London.