Did you have any particular examples in mind?

Typically, claims of interconnected, trans-oceanic ancient civilizations are based on stripping individual bits of evidence from their context and then acting like that original context never existed to begin with. I've discussed some of that here. When you have thousands of years of an entire continent's history to pull from, it shouldn't be surprising that you can find examples of any one symbol or another.

You can read more this in our FAQ as well