Well, the written text was 100% accurate, wasn't it?

In Star Wars: Episode IV--A New Hope, the take-off of the Millenium Falcon was filmed as a model against a blue screen and matted into a shot of a building with imperial stormtroopers firing upward."- Film Art 8th edition

If I am not mistaken, those are all facts, it was just the picture included to illustrate this was inaccurate. Might not have even been the same person who wrote the text that was in charge of finding illustrations. Perhaps the person responsible didn't even realize that the shot had been altered, there seems to be a great deal of ignorance surrounding the original Star Wars films and the alteration that have been made to them.