The sunken cars license plate is 'Louisiana 007 o 981' This plate is used in several shark films throughout the years. The first instance was when Hooper (Richard Dreyfuss) pulled it out a tiger shark in Jaws (1975). The same license was pulled in Deep Blue Sea (1999) by Carter Blake (Thomas Jane) from another tiger shark.
Despite the story of the film being about a Bull Shark, the poster displays a Great White Shark.