The data points surrounding those anomalies were reasonable, and the main sets of jumps I saw were either in places where I likely had poor GPS penetration or w

The data points surrounding those anomalies were reasonable, and the main sets of jumps I saw were either in places where I likely had poor GPS penetration or were quite old (back to the Google Latitude days). There were also precision indicators for many that made it pretty clear that they were locations based on connecting to a relatively distant cell tower. My expectation for the absurd jumps was that Google was calculating locations based on identifying WiFi devices in the vicinity and that for some devices there were duplicate MACs distributed in different regions (or possibly that the MAC on some equipment was being set from configuration rather than being hard-coded). I did not check to see if any of them were 00:DE:AD:BE:EF or the like since I generally only noticed several weeks after the event.