VIEWER COMMENTS:
This is clearly a double exposure. The reason so much of the interior of the car is visible is possibly because the car has barn type doors, which open away from each other. The edge of the right hand door while it was open can just be seen about halfway up the front fender. The reason all the edges line up is because a steady tripod was used, a practice not common today but very common in the 1930s before hand-held cameras became widely available.   _Doug A.

VIEWER COMMENTS:
I think it is a double exposure, if you look to our right of the driving child there is a sort of black angular mass, I think that is the car door open, and the Dad was standing a little more to our right and the mother also, cause in this final photo, car door shut and both people standing a little more to our left then the first photo, father has mothers front of her dress on his chest,  hence a double exposure, because film cameras sometimes would not forward the film when winding, see what you think, thanks, Janna in Boise, Idaho

VIEWER COMMENTS:
It is just reflection. If you study pictures of 1940 Packard you will notice the curvature of the body. And probably it is the reflection of the child at right of the photographer and the dog is looking at the child. It seems that the reflection ends at a vertical line. I searched through many images and found the answer. there is a vertical bend at the the same point. I am attaching an image of 1940 Packard from sunset classics where it is clearly visible due to the angle the picture is taken but front picture (or other models) don't show that. Image of 1939 is an example of reflection. Thanks   _Noman