Modern Japanese cars all have a door chime when you leave the keys in the ignition and have the driver door open. Does my head in.
AU market 240z's didn't have any seat belt warnings. US market did, it's 1 of those blanking plates in the centre console of the fuse cover (72/73 model consoles). Or put another way, why our fuse covers had nothing in them. Might have been a federal mandated thing in the US to comply with.
We got it much later in 260z's, like a lot of things.. probably as our own ADRs caught up.