Plot hole: When Elizabeth is interviewing Victoria for the first time, she mentions that Victoria had sent her an application, therefore her name had to have been on it. However, Maggie Evans didn't change her name to Victoria Winters until she was on the train en route to Collinwood for the interview, therefore Elizabeth would have been expecting Maggie Evans, not Victoria Winters.
Factual error: The train sequences that are supposed to be in 1972 show Amtrak cars that were not built until the 1980s, and the rear (pusher) locomotive was not built until after 2000, as was the modified locomotive/control car in the front. The Amtrak graphics are from this century also. They went to the trouble to create 1972 Maine license plates for the vintage autos, and spent millions on effects, but they can't contact a historical society for the use of a correct coach for a day and search for stock footage of a train that's not 40 years too modern?
Continuity mistake: When Barnabas stops the disco ball from landing on David, he is set on fire. Willie then chucks a pail of water on him to stop him burning. The next shot shows the bucket Willie holds and there is no trace of water, nor is the bucket wet, even though he'd just used water from the pail to throw at Barnabas.