The text for calling royal carriage when a golem is played makes it really hard to tell if you are calling the royal carriage for the golem or for whatever the golem is calling.
The text on the reaction should actually say the name of the card or 'golem' so that you can make sure that you are replaying the correct card.
I agree. The same problem exists with Sauno and Avanto (which I just experienced today).
Unfortunately, this is a consequence of the fact that only a few cards get 'special' treatment and the text for their triggered abilities contains variable information. Most cards (incl. Royal Carriage) gets a fixed text, so the text can't say for which Action it is.
It doesn matter often because you usually only have an Actioon 'going on' at a time. Golems, Throne Rooms and Avanto/Sauna chains are the problematic cases.