Plug and Play on HDtv

My son and I tried a Space Invaders plug and play on his HDtv for about 5 minutes. We turned it off and there was a little after image on the screen. I was surprised because it was only 5 minutes and there should have been no burn in. Anybody have this issue before? The tv is an Insignia.

If it has an IPS screen it could exhibit a little bit of image retention, but it shouldn't last too long. Which model is it?

I forgot the model # , I'll have to check tomorrow when I'm ipstairs. The image is now gone, we also reset the TV just to be safe.