In the sequence where Maria (Julie Andrews) takes the children to a market, at a fruit stall there is clearly a box of oranges - from Israel. The action takes place in 1938-9, 10 years before the establishment of the state of Israel!
This is not a legitimate slip-up. As Robert Wise himself pointed out, the boxes with the Israel markings never appear in the film. In the movie itself, the boxes are not within the frame of the shot. They appear only in photographs taken on-set during filming. Obviously, this poster merely copied this mistaken "slip-up" from elsewhere without actually viewing the movie himself.