Factual error: At the beginning of the episode it is stated that we are in the month of April - yet in the orchard there are ladders, fallen apples and baskets filled with fresh fruit everywhere, as if it were harvest time. The god is declared to grant fertility and not climate change, so the harvest decoration seems definitely out of season.
The Benders - S1-E15
Factual error: Officer Kathleen looks for Sam's data in her database. The record ID is DF-23094. She then follows the link to Dean's record. Its record ID is also DF-23094. A database cannot have two records with the same ID.
Factual error: At the beginning of this episode, it says "one week later", then it shows Dean and Sam go to the victim's apartment. The blood is still bright red. After a week it would be darker.
Answer: Angels themselves may not have genitalia, but their vessels do. Nephilim occur when an angel in a vessel reproduces.
Greg Dwyer