There’s more than that. In Australia, there’s Eucla time zone. It’s unofficial, so wouldn’t be included even though the locals use it. Eucla is close to SA border on WA side, so it’s 3/4 of an hour offset, halfway between Australian Central time and Western Time.
Aren’t some First Nations communities in the USA also on their own time zones?
China has the largest longitudinal range for a centralised time zone. Makes for some weird times of day/night.
In Antarctica, there are different time zones.