When Myka, Pete and Artie are attacked by the astral projection of Roaring Dan, they recognize it by the two missing fingers on its right hand. But the mummy of Roaring Dan is missing two fingers on the left hand.
Myka says "Lontitude and Latitude". The word is Longitude.
Roaring Dan Seavey's vessel is depicted as a 17th century sailing ship. He actually operated in the late-1800s and early-1900s.
The move from Warehouse 12 (in the UK) to Warehouse 13 (in the USA) took place just before World War I. The pirates and the Royal Navy from that time are depicted as using wooden sailing ships, which the Royal Navy would certainly not have used in 1914 for that purpose as they were obsolete.
When Pete and Myka pull up and park in front of the house, the camera crew is reflected in the side of the car.