This post consists of a list of a couple of miscellaneous observations on the film.
1. The Graham home is in Captiva, Florida - the city's name is similar to the word 'captive'. This name thus symbolizes the idea that Molly and Kevin are, in a sense, 'captives' of the killer within Will.
2. There are references to water in the movie: during the scene in the Jacobis' back yard, the music playing is the song Evaporation (by the band Shriekback); later, another song by the same band, Coelocanth, plays during the tiger scene. A coelocanth is a prehistoric fish. Later in the analysis, we will see that there are references to water in the film in addition to the two mentioned here.
Above left: Graham in the Jacobis' back yard. Above right: The tiger scene.