 Trevorrow and Connolly retained Spielberg's three ideas, although Trevorrow felt the concept of trained raptors was, in its original form, too extreme and had to be "pulled way, way, way back".A few months after being hired, Trevorrow read through each of the previous drafts for the film.Trevorrow said each previous draft "tried to do something different" from the earlier films in the series.