How do we know they are errors? How do we know that we're not looking at plots from multiple jets?

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I believe that is another plot point, and it would seem to line up with the plot points along the line south of the I-5 bridge. They appear to be errors off by approximately 4.5 nautical miles.

That's not the biggest question on this section of the map, IMO. There is a plot point at approximately 45 39' and 122 34'. The next visible plot point is at approximately 45 36' 33" and 122 40' 28". There is over a 5 nautical mile distance between those two points. There doesn't appear to be any plot points between them. The map suggests that their should be one near the east side of Pearson Air Park, but that would only be 2 nautical miles to the next point by the bridge - and that's being generous.

Looking at it, it seems pretty clear to me that they line up perfectly with the plot points under the black line. All of them are off by equal distances

How do we know they are errors? How do we know that we're not looking at plots from multiple jets?

There were four jets related to this incident--305, two F-106's and one T-33. And I have seen enough through out this case to seriously question how this map was put together. Specifically what data was used and in what form was it presented? How were the four different jet radar plots separated? Who plotted this and when?