"Timing is everything," Kudrow said of finding the note, which Perry wrote and put in the jar before giving it to her following the finale taping in 2004

Kudrow said she and the six core cast members of 'Friends' only got together once 10 years after the series ended

Kudrow specifically credited Jennifer Aniston, Courteney Cox and Matt LeBlanc for making sure the group always practiced "respectful communication" with each other