Scene with Steve Martin racing Kevin Bacon for a taxi references scene from Quicksilver, which also featured Bacon
Poster is shown in a video store.
Kevin Bacon's character is called Smilin' Jack in both movies.
movie poster on the wall of Grace's bedroom
Castle describes the bike messenger as 'pulling a Kevin Bacon in Quicksilver'.
mentioned in dialogue
Geary mentions this movie by name.
movie playing in theater