How do I make a picture look like it's slide across a cell phone and not the SL slide?

Hi Sheila, 

Happy to help!

One solution that you can do is to take a screenshot of the right slide of your slide, place this image on the right side of the screen and allow the image that appears on the iPad to pass under the overlay image. This will give the effect of the image entering from the right side of the iPad instead of the right side of the slide. 

I've attached a sample file so you can see how this concept works. Just replace the right side rectangle with an image that looks exactly like the original appearance of the right section of the slide, including the right part of the iPad, and this will cover the entrance of the rectangle.

Hope this helps!