When Dallas and Newland are seen getting into the limousine, Newland is sitting on the far side and Dallas on the near side. Also Dallas is carrying his coat in his right arm. In the next shot when they are seen just seated, Newland is on the near side and Dallas on the far side. Also Dallas is carrying the coat on his left arm.
As evidenced by a dated letter, Newland assisted Ellen with her divorce case in August 1879. Newland and May were married just after the following Easter, which would make it 1879. After returning from their honeymoon, they receive an invitation for a party on Wednesday, October 2nd. That would be correct if it was still 1878, but in 1879, October 2nd was a Thursday.