For years now I've visited a website called Chrono Compendium , it's a huge treasure trove of information, fan projects and translations about the Chrono series and you can tell whoever has maintained the site over the years is really passionate.
One of my favorite finds was this page on easter eggs in the game. Listing things such as a possible picture of Janus and Schala, being able to see Magus' shadow and reading the opening dialogue of Radical Dreamers.
http://www.chronocompendium.com/Term...no_Cross).html
One of my favorite bits about the game was being able to go to Lucca's house/orphanage as it's burning to the ground and you're able to see pictures of Chrono Trigger characters on the wall. You can also input the same code that saved Lara's legs in the first game to get a really powerful attack for Kid.
I also like that Chrono Trigger DS was able to give a little hope that Guile may in fact be Magus, because at the end of Trigger Magus erases his memories.
Do you have a favorite way in which these games collide?