If you've saved the pictures incorrectly, can you use Photoshop to change the dimensions, even with the Disney borders?
The proportions don't match up. If you resize a 5x7 to a 4x6 the whole picture will look squished. Here are a couple of images I threw together to illustrate the problem better.
Here is a rather goofy image I created at 5x7 proportions.
Here is what happened with I resized it, disproportionally along height and width, to force it into 4x6 proportions:
Note how the circle from the 5x7 is now a squished oval in the 4x6. You might think that it's not noticeable here, but the human eye is very forgiving with shapes. It is NOT forgiving on faces, or on images of things we're very familiar with. (Like, say, Cinderella Castle.)
I can also tell you why I think the images start out at 5x7, not that it will make anyone feel better who is caught in this situation. If you have an image file that is sized proportionally to print out without cropping at 5x7 and you re-crop it to print a 4x6, you generally get better results (don't have to crop out as much of the image, so you will probably get a better composed picture) than if you start with an image file that is sized to be printed at 4x6 that you then re-crop to print out at 5x7.
I think their intentions are good, though they haven't made it very obvious. (I usually leave my own personal digital image files in the same proportion they came off the camera in, leaving as much image information as possible. That can be easily edited to a lot of different size prints and if I save an image file in a certain proportion for a certain size print, I change the filename to reflect what proportions that image file has been saved in so I don't get it mixed up with the original later if I am editing it to get a print at a different proportion.) So leaving the default at a 5x7 proportion enables you to, most of the time, get a much better crop at both 5x7 and 4x6...you'll have more options of what part of the image to keep when sizing down to 4x6 that way.
The
trick is, you kind of have to make it glaringly obvious when you are defaulting to a different size than most people make their regular prints as a keepsake for a vacation, and I think they've fallen down a bit there. I mean, I've jockeyed images both as a web professional (before I was a SAHM) and then as an obsessed, take-too-many-pictures mom and I almost missed the photo size pull-down menu on the Photopass website. I might have missed it altogether if I hadn't intentionally taken my time during my purchase window to see if a better special offer came up.