i don’t have a complete list, but (for example) whenever you reference a geographic location’s Timezone, that’s a live call to Google’s API. Similarly, I’m pretty sure that referencing a geo location’s “formatted address” does the same.
Having a repeating group that displays these things is a good way to rack up API calls. So, when you acquire a geo location, you should cache and store derivative values that you will reference frequently later.
(This is not documented.)
Old thread on this:
(Note that the bug I refer to in the end of the thread is long solved — bubble was making the calls incorrectly [sans key], but it took quite a while for that to get fixed. When working with Bubble, file bug reports early and often.)