Kismet references
UDK
Nodes from the TAGame and a few other folders were added to UDK by Psyonix. For all other nodes you can head to the official Unreal Kismet Reference Home Page, or view per category:
UDK Documentation: Disabled nodes
Psyonix has not included all kismet nodes that can be found in UDK. For a complete list of all kismet nodes that do not work in Rocket League see the reference list below. To see the kismet nodes that have been added to the game or the other classes that have been removed, check out the dummy classes changelog
List of disabled nodes
Game references
Search for a kismet node in the reference list on this page of all kismet actions and events added by Psyonix from the Dummy Classes
More information about the classes can be found in these references:
Game map kismet
If you want to copy or view the kismet of an official map, you can use this experimental build of Unreal Explorer