I enjoyed this series very much. Overall, an entertaining, intriguing story.
Two things did stand out for me. First, the Yellow Card Man - what or who exactly was he? He is supposed to be a fellow time-traveller, if I understood it (from another portal?), and has been repeatedly failing at trying to stop his daughter from drowning. I can follow that. But he is in Lisbon Maine, and then Dallas, and is following Jake around??? Anyone who could explain this would have my thanks.
Second, although time and distance does fade our memories, would not Old Sadie have recognized Jake while dancing as the wet and dirty handsome man who approached her on that day in Lisbon Maine? He certainly made an impression on her. I suppose he may have done another journey that wiped out and reset everything (perhaps just to watch her drive by?), but that is not shown. Odd!