Sure; happens every so often to ALL the marketers/manufacturers - especially in
low-end or toy-level product - probably especially so in "created collectible" sets.
High-end/scale products are by far more accurate in their presentation, as they have
a more discerning audience - and bigger price tags.
No one is perfect. In the recent offerings by Weaver (and they don't make "toys") there
is a nice, scale, blue GM&O boxcar. I bought it, knowing that it was blue. The GM&O
never had any blue boxcars. Any. Lots of green ones, though. I bought it for the novelty (I think that the lettering is a bit off, style-wise, too) of it. Weaver makes consistently good stuff. Oops.
I have a photo of the GM&O boxcar that Weaver made (the same series, that is). The photo
is only fair, the car is actually green, but it sure could pass for a blue in the photo.
With the low-end stuff, off-color (and off-everything) is common, but not too bad, as
these products have a whole different purpose in life.