http://shmuplations.com/chronotrigger/
These two interviews with the Chrono Trigger development team were found at the GSLA. The first interview, from 1994, comes before Chrono Trigger was released and contains an interesting description of a more free-form event system that was never fully implemented, as well as an account of working together with legendary Enix developer Yuji Horii. The 1995 interview goes over the graphics, memory limitations, and development process at Square generally.
I’ve also included a short excerpt from a recent interview between Yoshinori Kitase and Hironobu Sakaguchi, which contains a few additional comments about the Chrono Trigger development.