Do they bother you?
If so, how much do they bother you?
In my case,they tend to bother me a bit and sometmies a LOT. I cannot understand why authors or editors/publishers don't have some subject matter experts available to check details.
A book I am reading now, within the first 50 pages (epub pages) it had a number of errors. Some minorly bothersome (Congressional Medal of Honor) and some more so (having a US Navy officer talking about "reupping" his "enlistment"). Also several aircraft/military flying errors.
And yes, I have an error in spelling error in the poll title.

In this case, enough that I will be unlikely to buy another book by theis author.