Other mistake: The episode's action takes place around 11:00pm (night time), yet all the scenes show broad daylight.
Other mistake: 1970: Barnabas fends off a werewolf by striking at it with his silver-headed cane. Unfortunately, the cane bounces off the resilient werewolf and hits Barnabas in the head. (Jonathan Frid reportedly had to have a few stitches afterwards.)