When going through Dohman's house to the basement and back, Red is off his robot, but is on again in the basement.
Punctuation mistakes in in-game text.
Character images are often flipped in cutscenes.
The pitch on the propeller on Red's first aeroplane is completely flat; it can not possibly produce thrust.
Vehicles are shown using single helicopter-like rotors. Nothing can fly with less than two rotors.
Pistons can only be found working within engines; there is no reason for them to be outside an engine.
Interiors do not match exteriors.
Flo somehow manages to be at every quest station.
On the train with ship parts can be found boats - even though ships travel through the air in this world and not water.
It is possible for Red to find money during the tests - in his own mind (which shouldn't be possible).
The pirate leader tells his crew to open the gunports, but they are already open.
At Maui, Elh acts like she hadn't seen the wooden men before despite having to have seen them on the way to get Raisin.