I put together a document that goes through the book of Acts and quotes – directly – extra-biblical documents to confirm or support a given event, person, cultural aspect, etc. that is present in Acts.
For example, in Acts 16:37 and 38 Paul and Silas are thrown in prison. But upon hearing that Paul and Silas are Roman citizens, the head magistrates become “frightened.” Why is that?
In Acts 8:27 – who is this Candace Queen of the Ethiopians? Did she exist?
Near the end of Acts Paul appeals to Caesar during his trial. Could Roman citizens do that in the first century?
And so on.
You can download the document in PDF from here.