Late into Jurassic Park III 's production , Spielberg devised a story idea which he believed should have been used for the third film instead .
In May 2001 , Spielberg had Amblin Entertainment commence development of ideas for Jurassic Park IV , which he planned to produce .
Late into Jurassic Park III 's production , Spielberg devised a story idea which Spielberg believed should have been used for the third film instead .
In May 2001 , Spielberg had Amblin Entertainment commence development of ideas for Jurassic Park IV , which he planned to produce .