[Mollypitcher1]

A couple of years ago I checked on Google Maps the house of a friend. The house matching my friends address on Google turned out to be one of his neighbors, not his address at all.

[TXnMA]

The error could be in how it was measured (located) -- or in how you are viewing it (probably the latter...).

Unless you have "elevation exaggeration" set to minimum (0.01) and tilt set to zero, Google Earth will always display location errors.

Also, differences in offset viewing angle between overflights (the satellite path seldom passes directly over your site of interest) can worsen the above errors -- if you have exaggeration and tilt on....

With Google Earth, I can survey irregularly-shaped tracts several dozens of acres in extent -- and still "close" (return to the POB) within a tenth of a foot. But -- that requires care in eliminating viewing errors as above...

YMMV...
TXnMA