When Thomas Wayne and Lucius Fox are walking down the street, the double decker bus they pass is a Left hand drive one so is parked with the step opening onto the road. As opposed to proper British vehicles that open on the left.
The aircraft that is meant to transport them back to the USA is a 1930s Consolidated PBY Catalina. A maritime patrol aircraft and seaplane. It has a maximum crew of 10 and a range of 2500 miles. It is in no way a transport aircraft and even lacks the range to fly directly between the UK and USA.